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FrOSCon 2026

Twenty-first edition, free entry, seven parallel tracks on a university campus.

Two days of free and open source software talks and workshops at the Hochschule Bonn-Rhein-Sieg, run by its computer science faculty with the FrOSCon association. Seventy-seven talks and twelve workshops across seven tracks plus a project exhibition, all streamed live. Entry is free for everyone, funded by partners rather than tickets.

• Keynote: Aleix Pol on thirty years of KDE and the next thirty
• Keynote: Gina Häußge (OctoPrint) on maintaining open source in public
• Seven parallel tracks plus two workshop rooms, all live-streamed
• Dedicated programme for children and teenagers, and LPI certification exams on site

ChaosZeltZone 2026

Five days of camping on a former collective farm in the Vogtland.

A small Chaos-scene camp on a disused agricultural site near Weischlitz that is slowly becoming a makerspace. Tents, talks and workshops rather than a conference programme, run by and for people from the ChaosZone network. Tickets are sold through Pretix and the site is remote enough that you should plan the drive.

• Site is a former LPG collective farm being converted into a makerspace
• Exact coordinates published by the organisers — the venue has no useful postal presence

Håck ma's Castle 2026

Austrian Chaos-scene camp in a Waldviertel castle and its apple orchard.

Four days of self-organised talks, workshops and camping at Schloss Ottenschlag in Lower Austria, run by the Austrian Chaos community. The programme is built by the people who turn up rather than a review committee, and the site pairs indoor castle rooms with a field for tents.

ContainerDays Hamburg 2026

Back to a three-day single-city format in a listed harbour warehouse.

Three days of Kubernetes, containers and platform engineering at Schuppen 52, a listed Imperial-era warehouse on the Hamburg waterfront, with a second stage aboard the historic vessel MS Bleichen. Ten tracks including observability, storage, Go and networking, plus a co-located AI Context event on the Model Context Protocol. Kelsey Hightower returns as the headline speaker.

• Four stages across three days, 120+ sessions
• Second stage aboard the MS Bleichen
• Co-located AI Context event on the Model Context Protocol
• Kelsey Hightower headlining

DevOpsDays Graz 2026

The Austrian DevOpsDays, two days in Graz run by the local organiser team. Follows the federation format of a curated talk track in the mornings and attendee-proposed open spaces in the afternoons, at a scale where the hallway track is the point. One of the few German-language-friendly delivery conferences in the Alpine region.

InselChaos 2026

Weekend gathering on Rügen, the northernmost stop on the German Chaos circuit.

Three days at La Grange near Bergen auf Rügen, on the Baltic island. Small, self-organised and closer to a retreat than a conference: talks and workshops arranged by whoever turns up, with the island itself as much of the draw as the programme.

ECML PKDD 2026

Europe's flagship academic machine learning conference, 2026 edition in Naples.

The European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, five days in Naples hosted by Universita di Bari, Universita di Napoli Federico II and ICAR-CNR. Peer-reviewed research alongside an applied data science track, an industry track, a demo track, a discovery challenge and a PhD forum - the applied tracks are what distinguish it from a purely academic programme.

• Applied data science and industry tracks alongside the research programme
• Discovery challenge and PhD forum
• Hosted by Universita di Bari, Federico II and ICAR-CNR

SmashingConf Freiburg 2026

Thirteenth Freiburg edition, single track, 300 people, in the Historic Merchants' Hall.

Smashing Magazine's home-town conference for front-end developers and designers, covering design systems, AI tooling, accessibility, CSS and animation. Four days: one pre-day, two conference days and two workshop days with six deep-dive workshops. Single track, twelve speakers, about 300 attendees, and an online ticket if you cannot travel.

• Jake Archibald (Mozilla) on web standards; Hidde de Vries (Logius) on the sustainable and ethical web
• Six deep-dive workshops across the two workshop days
• Runs in parallel online for remote attendees
• Scholarships and volunteering places available

PyData Amsterdam 2026

Two days at NDSM Loods, double-blind reviewed programme.

The Dutch PyData, two days at NDSM Loods in Amsterdam North, run under NumFOCUS. Proposals are reviewed double-blind and the organisers explicitly ask for non-LLM subject matter - statistical modelling, data engineering, visualisation, time series, geospatial - alongside the AI content. Standard talks are 30 minutes, deep dives 45. Accepted speakers get a free full pass.

• Double-blind proposal review
• Standard talks 30 min, deep dives 45 min
• Speaker mentorship programme for first-time presenters

SEC-T 0x12

Stockholm's single-track technical conference, plus a free community day the day before.

A non-profit, English-language, single-track IT security conference at Münchenbryggeriet in Stockholm, deliberately free of vendor pitches. Two conference days on 10–11 September preceded by a half-day Community Event on 9 September that anyone can attend without a ticket. Speakers get a 20,000 SEK honorarium, which is unusual in Europe and shows in the research quality.

• Free half-day Community Event on 9 September, open without a ticket
• Single track, 30- or 45-minute talks, previously unpresented research preferred
• Speaker honorarium of 20,000 SEK plus travel and accommodation

Big Data & AI Paris 2026

Repositioned for 2026 towards enterprise decision-makers, with selective visitor qualification.

France's largest data and AI event, run by RX at Paris Expo Porte de Versailles. The 2026 edition is deliberately narrowing: the organisers state they are refocusing on enterprise decision-makers, applying selective qualification to visitor registrations and prioritising business access. Programme runs across three rooms - tech, governance and business - with around 350 sessions. Held under the patronage of the French presidency.

• Three programme rooms: tech, governance and business
• Around 350 conferences and workshops, 200 exhibitors
• Advisory board drawn from AXA, L'Oreal, SUEZ and Credit Agricole

DevOpsDays London 2026

A single-day DevOpsDays in London, the UK edition of the federation. Short-form talks plus open spaces covering delivery practice, reliability and engineering culture, aimed at practitioners rather than vendors. London's density means this fills quickly despite the one-day format.

Datenspuren 2026

Twenty-second edition in Dresden, motto "aufbrechen", free entry.

The annual hacker gathering of CCC Dresden, at the Zentralwerk in the north of the city. Three talk rooms plus workshop space, with a programme that runs from surveillance and decentralised infrastructure to sustainability and a Junghacker track for children. Admission is free and talks are streamed and recorded.

• Three talk rooms plus dedicated workshop space
• Junghackertrack with soldering, programming and modelling for children
• Call for artists runs alongside the talk call — installations, light, music

Cloud Foundry Summit 2026

The Cloud Foundry community's European gathering, two days in Heidelberg run by the Cloud Foundry Foundation under the Linux Foundation. Programme is platform-as-a-service operations and application delivery for organisations still running Cloud Foundry at scale, which in Europe is heavily SAP and telco. Small and specific rather than a general platform conference.

Big Data LDN 2026

Free to attend, Olympia London, over 400 seminars across two days.

The UK's largest data and analytics exhibition, run by RX at Olympia London and free to attend. Over 400 seminars across a two-day programme, with Databricks, Google Cloud and Snowflake as diamond sponsors - the balance between conference and trade show tips towards the latter, and the theatre content is largely vendor-supplied. A separate paid Data Driven LDN track runs alongside for senior practitioners.

• Free entry, over 400 seminars
• Wed 09:00-18:00, Thu 09:00-17:30
• Co-located Data Driven LDN paid track on AI agents, governance and data products

German OWASP Day 2026

The German chapter's national application-security conference, in Karlsruhe.

Two days of application security run by the German chapter of OWASP, the national counterpart to Global AppSec. Programme is practitioner-facing — secure development, DevSecOps and the OWASP projects themselves — and it is the main German-language AppSec fixture of the year.

OWASP AppSec Days Portugal 2026

Portugal's OWASP chapter conference, two days of keynotes, workshops and a CTF.

The Portuguese OWASP chapter's national application-security conference, aimed at security professionals, developers and architects. Two days combining keynotes, hands-on workshops and a capture-the-flag, with the organisers expecting 400-plus attendees. Sits five weeks before BSides Lisbon, so the two are a plausible pair for one trip.

BruCON 0x12

Belgium's hacker conference, in Mechelen rather than Ghent since the venue move.

Two conference days at Lamot in Mechelen, preceded by three days of deep-technical training at the Novotel. Alongside the talks there are workshops, an IoT/ICS village, a hardware-hacking space run by Ko-Lab, an online CTF and a 10km hacker run. Ten minutes' walk from Mechelen station and twenty minutes from Brussels Airport.

• Three days of training on 21–23 September at the Novotel before the conference
• IoT/ICS village, hardware-hacking space and a retro-gaming room
• Online CTF running from day one, and a 10km hacker run on day two

OWASP AppSec Days France 2026

First local OWASP conference held in Paris.

A single-day application-security conference in Paris, the first local OWASP event France has run. The programme is drawn from European speakers and the organisers expect over 150 security professionals. Worth noting for anyone tracking the French scene, which is otherwise almost invisible to English-language search.

Paris Web 2026

Twenty-first edition of the French-language web conference, and the only one that signs every talk live.

Two days of talks and workshops for francophone web professionals, weighted heavily towards accessibility, inclusive design and web standards rather than framework news. Every session is interpreted into French sign language in full and in real time, which no other European web event does. Sessions run 30 or 50 minutes; workshops 90 or 180.

• Every talk interpreted live into LSF, in full
• Programme is accessibility-first: RGAA 5, FALC, screen readers, inclusive language
• Talks published free to watch afterwards, archive back to 2006

React Alicante 2026

Spain's international React and React Native conference, workshops on the Thursday.

An English-language React and React Native conference at the Palacio de Congresos in Alicante: workshops on Thursday 24 September, then two conference days. Programme this year leans into what comes after React as much as React itself, plus the Node.js tooling shake-up. One of the few large frontend fixtures in Spain and the reason the Spanish cell in this index is not empty.

• Workshop day on Thursday, conference on Friday and Saturday
• Talks in English despite the Spanish setting

Mega-Knowledgecamp 2026

Weekend camp run by hacksaar at the HTW Saar campus.

A two-day community knowledge camp organised by the Saarbrücken hackerspace hacksaar at the HTW Saar. Barcamp-shaped rather than a curated conference: sessions are proposed on the day and skew towards hardware, tooling and the practical end of security.

Quellc0d3 2026

Three days in a former boiler house in Nuremberg, run by the 0x90 space.

A small Chaos-adjacent gathering at the Heizhaus in Nuremberg, organised by the 0x90 hackerspace. Talks, workshops and a lot of unstructured time; closer in spirit to a camp than a conference despite being indoors. Overlaps with Mega-Knowledgecamp on the same weekend.

Kubernetes Community Days Sofia 2026

Bulgaria's CNCF-backed community day, capped at 600 seats.

A one-day community-run Kubernetes conference at Sofia Event Center, in its second CNCF-backed year after growing out of a 2018 meetup. The programme covers platform engineering, observability, security and AI on Kubernetes, mixing local and international speakers with hands-on workshops. Attendance is hard-capped at 600.

• Hard cap of 600 attendees
• Chris Aniszczyk (CNCF CTO) listed as a speaker
• Tracks on platform engineering, observability, security and AI on Kubernetes

DevOpsDays Vilnius 2026

Fourth Vilnius edition, in-person only, at Kablys 2.0.

The fourth DevOpsDays Vilnius, run by the Lithuanian organisers at Kablys 2.0 over two days. Standard DevOpsDays shape: a curated single-track morning followed by open spaces set by the room. The organisers state it is in-person only, with no virtual track, and the schedule is already published on their pretalx.

• Fourth Vilnius edition
• In-person only, no virtual track
• Schedule already published

Digital Independence Days 2026

First Hamburg edition, aimed at the public rather than at practitioners.

Three days on digital independence at the Kultur Palast Harburg, organised by CCC Hansestadt Hamburg and the Wau Holland Foundation with neighbourhood initiatives, makerspaces and hackerspaces. The programme is practical and consumer-facing — messengers, office software, running your own cloud — rather than a research track.

• First edition — the Digital Independence Day initiative only started in December 2025
• Run jointly with Hamburg neighbourhood organisations, not only hackerspaces

RomHack Camp 2026

Second edition of the outdoor camp — and the reason there is no RomHack Conference this year.

Three days of talks, workshops and community villages at Flaminio Village in Rome, run by the non-profit Cyber Saiyan. The organisers have replaced the usual indoor conference with the camp for 2026 and expect around a thousand people from forty countries. Accepted speakers get a free ticket and a tent spot but no travel money; a 12-hour overnight CTF final runs on the Friday.

• No indoor RomHack Conference in 2026 — the camp replaces it
• From Dusk Till Dawn: 12-hour on-site CTF final, 19:00 to 07:00 on 2 October
• Free community booths for non-profit security and tech groups
• Four days of paid training at Polo Didattico immediately beforehand, 28 September to 1 October

DevOpsDays Prague 2026

One-day Czech edition of the DevOpsDays circuit.

The Prague edition of DevOpsDays, a single day of talks and open-space sessions on delivery practice, platform operations and the organisational side of running systems. Programme not yet published; the call for proposals is hosted on the DevOpsDays pretalx instance.

• Single-day format
• Open-space sessions set by attendees on the day

Observability Summit Europe 2026

One day, co-located with the Linux Foundation's Prague week.

A one-day Linux Foundation summit on observability practice, co-located with the Prague cluster around Open Source Summit Europe. Covers instrumentation, tracing and telemetry pipelines with an open-source bias - OpenTelemetry, Prometheus and the surrounding tooling - rather than vendor platform pitches. Worth pairing with the other Prague events that week.

ValkeyConf 2026

One day on Valkey, co-located with the Linux Foundation's Prague week.

A single-day conference on Valkey, the Linux Foundation's fork of Redis, co-located with Open Source Summit Europe in Prague. Programme covers operating Valkey in production, the client ecosystem and the project's divergence from upstream Redis. A contributor summit runs the following day for people working on the project itself rather than deploying it.

ONE Conference 2026

The Dutch NCSC's invitation-only cybersecurity conference in The Hague.

Two days run by the Netherlands' National Cyber Security Centre and the Ministry of Economic Affairs, aimed at cooperation between government, industry and research. Plenary sessions plus smaller breakouts, spanning deeply technical work, law-enforcement cases, public-private governance and current research. Attendance is by invitation — you request one and are reviewed in rounds through July, August and September.

• Organised by NCSC-NL with the Ministry of Economic Affairs and the City of The Hague
• Attendance by invitation request rather than open ticket sale

Valkey Contributor Summit 2026

Working day for Valkey contributors, the day after ValkeyConf.

A contributor-facing working day for the Valkey project in Prague, immediately after ValkeyConf and inside the Linux Foundation's Prague week. Aimed at people who maintain or patch Valkey rather than operate it, so the shape is roadmap discussion and working sessions rather than a talk track. Attendance expectations were not published at the time of this run.

Open Source Summit Europe 2026

Co-located with Embedded Linux Conference Europe; eleven tracks under one umbrella.

The Linux Foundation's main European gathering, running alongside Embedded Linux Conference Europe. Eleven tracks covering the kernel, cloud and orchestration, supply-chain security, open AI and data, and OSPO management, with two days of co-located events beforehand. Scholarships and travel funding are available, and childcare is provided on site.

• Co-located events fill Monday 5 and Tuesday 6 October, before the main programme opens
• Embedded Linux Conference Europe runs in the same venue
• Zephyr Developer Summit and PX4 Dev Summit are inside the same CFP umbrella
• Scholarships, travel funding and on-site childcare available

PromCon Europe 2026

The Prometheus project's own conference, single track and maintainer-led.

The Prometheus community's own European conference, two days in Munich. Single track, maintainer-heavy, and the place where changes to Prometheus itself and the surrounding exposition formats get argued about in public. Deliberately small - if you run Prometheus at scale this is the highest signal-to-noise observability event in Europe.

World Summit AI 2026

Tenth Amsterdam edition, anchoring World AI Week.

A large commercial AI summit run by InspiredMinds, two days in Amsterdam and the anchor event of World AI Week. The programme is strategy and industry-application led rather than a peer-reviewed research track, drawing enterprise leaders, startups and investors alongside academics. Judge it as an industry summit, not a conference with proceedings.

• Tenth anniversary edition
• Anchors World AI Week, 5-9 October 2026, with 50+ affiliated events
• Organisers project 15,000+ attendees across the full week

Interfug 2026

Chemnitz weekend gathering in the Lokomov.

A three-day community event in Chemnitz run out of the Lokomov, one of the smaller stops on the German Chaos circuit. Talks and workshops on security, privacy and net politics, organised locally and advertised almost entirely through the CCC calendar and Fediverse.

No Hat 2026

Eighth edition, one day, two tracks, organised by the Bergamo hacklab BITM.

A single-day technical security conference in Bergamo run by the BITM hacklab, split into a research track and a technical track with 45-minute slots delivered in English. Topics run from side-channel attacks and SDR to DFIR and telecom security. A separate Italian-language executive track addresses smaller businesses.

• Accepted speakers get travel and two nights' accommodation
• Italian-language executive track for the SME sector alongside the main programme
• 1.5-hour hands-on workshops in addition to the talks

BazelCon 2026

Build systems, remote execution and monorepo tooling.

Three days in Amsterdam on Bazel and the build-systems problem generally: remote execution, caching, monorepo migration and the CI economics that follow from them. Run under the Linux Foundation with heavy Google and enterprise-monorepo participation. Narrow subject, but the only European event that treats build infrastructure as a first-class topic.

SREcon26 Europe/Middle East/Africa

USENIX's European SRE conference, all talks in person, at the Convention Centre Dublin.

USENIX's site reliability engineering conference for the EMEA region, three days at the Convention Centre Dublin. The programme is chosen by a committee drawn from Jane Street, Bloomberg, Wikimedia, Zalando, Reddit and Google rather than by sponsors, and leans towards operating large distributed systems in practice. Talks require in-person attendance; there is no virtual track.

• Programme co-chaired by Stephane Dudzinski and Philip Rowlands (Jane Street)
• Grant (travel/diversity) applications close 8 September 2026
• Early Bird registration closes 24 August 2026

Kubernetes Community Days UK - Edinburgh 2026

Two days at the University of Edinburgh; CfP already closed.

The UK's community-organised cloud native conference, back in Edinburgh for a second year across two days at the John McIntyre Conference Centre. Talks cover successes and failures running cloud native technology in production, alongside free vendor-run workshops offered first-come first-served. Volunteer-run, with surplus donated to charity.

• Free hands-on workshops alongside the talk track, first-come first-served
• Breastfeeding-friendly, with a quiet room and support for parents and caregivers
• Governed by the Linux Foundation Code of Conduct

AI Congress Barcelona 2026

Twelfth edition of Catalonia's applied-AI congress, run by CIDAI and Eurecat.

Three days at L'illa Auditorium aimed squarely at people deploying AI inside companies rather than at researchers: multi-agent orchestration, GDPR and agentic systems, vertical models, data spaces and synthetic data, with case studies from CaixaBank Tech, Nestle and Laboral Kutxa. Run by CIDAI and Eurecat under the Catalan government's AI strategy, so it leans public-sector and industry rather than vendor.

• Twelfth edition, formerly the AI & Big Data Congress
• Programme in Catalan, Spanish and English
• Sessions on agentic AI and GDPR, and on AI sovereignty and auditable architectures
• Organised by CIDAI and Eurecat under Catalonia.AI

hack.lu 2026

Twentieth edition, organised by CIRCL, with the Cyber and Threat Intelligence Summit inside it.

Four days in Luxembourg run by the national CSIRT, CIRCL, mixing technical and non-technical sessions on attack and defence, open-source security tooling and real-world incident work. The co-located Cyber and Threat Intelligence Summit is the draw for the MISP and intel-sharing community. Talks are 20 minutes plus 10 of questions, deliberately, to keep discussion going.

• Co-located Cyber and Threat Intelligence Summit
• Speakers get four nights' accommodation and up to EUR 300 travel
• Capture the Flag alongside the talks and trainings
• Call For Failures evening session on real cybersecurity mistakes

Hacktivity 2026

Central and Eastern Europe's longest-running hacker festival, twenty-plus years in Budapest.

A one-day IT security festival in Budapest with three presentation tracks, two-hour workshops, a hack centre and an expo, drawing around a thousand people from across the region. Expo registration is free; conference tickets are priced in forints and are cheap by Western European standards. Speakers for 2026 were announced in July.

• Three presentation tracks plus two-hour workshop sessions
• Free expo registration for anyone who only wants the exhibition floor
• About 1,000 attendees; the largest event of its kind in Central and Eastern Europe

Cloud Native Days Poland 2026

KCD Warsaw rebranded and widened beyond Kubernetes, on the 43rd floor of Varso Tower.

The team behind KCD Warsaw 2025 has renamed and broadened the event into Cloud Native Days Poland, adding software architecture and DevOps to the Kubernetes programme. One day at Varso Tower in central Warsaw, CNCF-supported and run with SysOps/DevOps Polska. Keynotes from Alex Chircop of the CNCF Technical Oversight Committee and a strong OpenTelemetry and platform-engineering strand.

• Successor to KCD Warsaw 2025 (200+ attendees)
• Held in Varso Tower, the tallest building in the EU
• Keynote by Alex Chircop, CNCF TOC
• Two minutes from Warszawa Centralna

BSides Lisbon 2026

Portugal's community infosec conference, running since 2013, all talks in English.

Two days at the dental medicine faculty auditorium of the University of Lisbon, run as a not-for-profit by the local BSides community. Regular, short and lightning formats, all recorded and published. 2026 keynotes are Udbhav Tiwari of Signal and Bryson Bort of SCYTHE and the ICS Village.

• Keynote: Udbhav Tiwari, VP Strategy and Global Affairs at Signal
• Keynote: Bryson Bort, founder of SCYTHE and co-founder of the ICS Village
• Three talk lengths including 5-minute lightning slots for first-time speakers

Black Alps 2026

Switzerland's main community security conference, at La Marive in Yverdon-les-Bains.

Two days and two evenings of keynotes and technical talks with around 600 attendees, plus networking dinners and a free ethical-hacking contest. Run by the Black Alps association, which also holds a purely social summer event in June. Registration is open from late June until mid-December.

• Free capture-the-flag contest with prizes, open to non-attendees
• 600-plus attendees, 20-plus talks, three side events

DevOpsDays Barcelona 2026

Two-day Catalan edition of the DevOpsDays circuit.

The Barcelona edition of DevOpsDays, two days of talks and attendee-driven open spaces on delivery, platform operations and the culture side of running production systems. Programme not yet published; proposals are handled through the DevOpsDays pretalx instance.

• Two-day format
• Open-space sessions set by attendees on the day

DevOpsDays Portugal 2026

Merged with KCD Porto 2026 this year, at the Super Bock Arena in Porto.

DevOpsDays Portugal returns after 2024 and merges with Kubernetes Community Days Porto for a single two-day event at the Super Bock Arena. The joint programme covers DevOps practice alongside Kubernetes, platform engineering and cloud native operations, run by DevOps Porto with the KCD Porto organisers. Registration is handled through the CNCF community platform rather than the devopsdays site.

• Joint edition with KCD Porto 2026
• Registration via the CNCF community platform
• First Portuguese edition since 2024

KCD Porto 2026 (with DevOpsDays Portugal)

Third Porto edition, merged with DevOpsDays Portugal at Super Bock Arena.

Portugal's largest Kubernetes and cloud native event, running two days at the Super Bock Arena and combined this year with DevOpsDays Portugal into a single programme. Last year's edition drew over 330 participants and 40 talks; organisers expect 500-plus across keynotes, parallel technical sessions and a sponsor floor.

• Combined programme with DevOpsDays Portugal for the first time
• Organisers expect 500+ attendees, up from 330 last year
• Two keynotes on day one, closing ceremony on day two

Nights of open Knowledge 2026

Two free evenings in the Lübeck university Audimax, running since 2011.

A volunteer-run knowledge festival at the Audimax of the University of Lübeck, from 17:00 to midnight on both days with talks starting at 18:00. The subject range is deliberately wide — research, archaeology, climate, medicine, journalism, digital independence, open source — and the organisers actively court first-time speakers. Admission is free.

• Runs 17:00–23:59 on both days; talks start at 18:00
• Explicitly welcomes first-time speakers and will pair you with a mentor
• Foyer booths for local groups and associations, and Saturday meetup rooms

DevOpsDays Warsaw 2026

Poland's largest DevOps conference, around 200 attendees over two days.

The Polish edition, described by its organisers as the largest DevOps conference in the country, bringing roughly 200 engineers together for two days of talks and open spaces. The stated programme covers platform engineering, Kubernetes, DevSecOps, observability, CI/CD, infrastructure as code and SRE. Run by a local community team with its own site and ticketing rather than through the federation.

• Around 200 attendees, two days of talks and open spaces
• Tickets sold via Eventory

Oh My Hack 2026

Poland's largest cybersecurity conference, eighth edition, with an English track for the first time.

A single day at the PGE Narodowy stadium in Warsaw, curated by Adam Haertle of Zaufana Trzecia Strona and run by Proidea. The 2025 edition drew 1,450 attendees and 65 speakers across several thematic tracks; 2026 adds an English-language track. Programme covers incident analysis, pentesting, defence, appsec and risk.

• First English-language track in the conference's history
• 1,450 attendees and 65 speakers at the 2025 edition
• Speaker travel covered up to 1,000 PLN plus accommodation

KCD Suisse Romande 2026

Two days at CERN, bilingual French and English.

The second Kubernetes Community Day run by the Association Cloud Native Suisse Romande, held over two days at CERN's Science Gateway in Meyrin. Talks are delivered in both French and English and the organisers plan for roughly 300 participants, making it one of the few cloud native events in scope that is not English-only.

• Held at CERN's Science Gateway
• Talks in both French and English
• Around 300 participants planned

KCD Provence 2026

First Provence edition, bilingual, and the only French cloud native event in the index.

A first-time Kubernetes Community Day at the Centre des congres in Aix-en-Provence, run by the Cloud Native Provence group with organisers from Dynatrace, Red Hat, Exoscale and Isovalent. Sessions in French and English across Kubernetes, GitOps, platform engineering, observability, security and AI. Deliberately small-format to keep the hallway track usable.

• First KCD in Provence
• Talks in French and English
• Call for papers open until 13 September 2026
• Organising team drawn from Dynatrace, Red Hat, Exoscale and Isovalent

40C3 — 40th Chaos Communication Congress

Moving from the CCH to the Hamburg Messe to reduce overcrowding.

The fortieth Chaos Communication Congress, four days between Christmas and New Year in Hamburg. Talks, workshops and self-organised assemblies across security, cryptography, privacy, net politics and art, with well over ten thousand people attending. This cycle it moves from the Congress Centrum to the exhibition centre.

• Venue change from the CCH to the Hamburg Messe for this cycle
• Self-organised assemblies alongside the curated talk tracks

Insomni'hack 2027

Eighteenth edition — three workshop days, then talks and one of the largest on-site CTFs in the world.

Five days at the SwissTech Convention Center on the EPFL campus, organised by Orange Cyberdefense Switzerland. Workshops run 1–3 February and the talks on 4–5 February, with the overnight capture-the-flag that made the event's name. Started as a small hacking contest in 2008 and is now one of the largest security events in Switzerland and the neighbouring regions.

• Workshops 1–3 February, talks 4–5 February
• One of the largest on-site capture-the-flag contests worldwide
• Programme for 2027 published in the second half of 2026

ContainerDays & AI Context Warsaw 2027

First Warsaw edition of the German ContainerDays series, co-located with AI Context.

The ContainerDays series leaves Germany for the first time, pairing its cloud native programme with AI Context, an event built around the Model Context Protocol and agent tooling. Two days of Kubernetes, platform engineering, security and observability talks plus hands-on workshops, aimed at the central European engineering market rather than the Amsterdam-Berlin circuit.

• First ContainerDays edition outside Germany
• Co-located with AI Context Warsaw on the Model Context Protocol
• Organiser projects 1500+ attendees and 60+ sessions

KubeCon + CloudNativeCon Europe 2027

The CNCF flagship, moving from Amsterdam to Barcelona.

The Cloud Native Computing Foundation's flagship European conference, four days at the Barcelona convention centre. As of this run the organiser has published dates, city and sponsorship terms but no programme and no call for proposals - the diamond sponsorship lottery closes 1 October 2026, which is usually the point the rest of the event machinery starts moving.

• Diamond sponsorship lottery entries close 1 October 2026, drawn 2 October
• Four days, 15-18 March, at the Barcelona convention centre

DevOpsDays Zurich 2027

The Zurich edition, historically held in Winterthur, returning in April 2027. Swiss DevOpsDays draws heavily from the banking and insurance engineering base around Zurich, which pushes the programme towards regulated-environment delivery and reliability rather than startup tooling.

beyond tellerrand Düsseldorf 2027

Two days where web development sits next to design, illustration and craft.

Marc Thiele's long-running Düsseldorf event, single track over two days, mixing front-end and web-platform talks with design, typography and creative work that is not obviously about the web at all. It is the deliberate breadth that people come back for rather than framework coverage.

JSNation 2027

GitNation's main JavaScript conference, Amsterdam, five days including workshops.

The general-purpose JavaScript conference in the GitNation stable, distinct from React Summit which runs the same week in the same city. Main conference talks plus in-depth workshops, discussion rooms and a remote track. If you are travelling to Amsterdam in May 2027, the two events are designed to be attended together.

React Summit 2027

Two tracks, 60-plus speakers, in-person on 21 May and remote on 25 May.

GitNation's React conference in Amsterdam, split across a Base Camp and a Summit track, with an interactive remote day four days later including hybrid speaker Q&A and online workshops. Around 1,500 people attend in Amsterdam out of a much larger online audience. Two smaller co-located events run the day before: Tech Lead Conf and Web Engineering Summit.

• In-person day 21 May, remote day 25 May — one ticket, two formats
• Tech Lead Conf and Web Engineering Summit co-located the day before
• Hackathon with EUR 10,000 in prizes, no conference ticket required

DevOpsDays Geneva 2027

The French-speaking Swiss edition, run at HEG Campus de Battelle in previous years. Two days of talks and open spaces covering delivery and reliability practice, with a programme that reaches into the CERN and international-organisation engineering community around Geneva.

Berlin Buzzwords 2027

Eighteenth edition; barcamp first, then two days of sessions.

Berlin Buzzwords covers modern data infrastructure, search and machine learning with a strong open source bias, run by Plain Schwarz at the Kulturbrauerei. The format opens with a barcamp and continues with two days of sessions. The organiser announced 2027 dates in July 2026 and says the call for papers opens in November.

• Opens with a barcamp, then two days of sessions
• Call for papers opens November 2026
• Eighteenth edition, at the Kulturbrauerei again

OWASP Global AppSec EU 2027

OWASP's flagship European conference, back in Vienna for a second year.

A week of training and conference days run by the OWASP Foundation at the Austria Center Vienna, the largest application-security gathering in Europe. Vendor-neutral by policy, with talks selected by committee and multi-day training either side of the main programme. Vienna is now confirmed as the venue through 2028.