2–4 Sep3 days500–2k
Back to a three-day single-city format in a listed harbour warehouse.
Cloud & Infrastructureverifiedcfp unknown
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
4–5 Sep2 days100–500
DevOps & SREofficial · partialcfp unknown
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.
4–6 Sep3 daysunder 100
Weekend gathering on Rügen, the northernmost stop on the German Chaos circuit.
Securityverifiedcfp closed
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.
7–11 Sep5 days500–2k
Europe's flagship academic machine learning conference, 2026 edition in Naples.
AI & Machine Learningverifiedcfp unknown
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
7–10 Sep4 days100–500
Thirteenth Freiburg edition, single track, 300 people, in the Historic Merchants' Hall.
Web & Frontendverifiedcfp closedHybrid
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
10–12 Sep3 days500–2k
Two conference days at the NDSM shipyard plus a tutorial day at Xebia's office.
AI & Machine LearningData Engineeringverifiedcfp closed
Two days of talks at NDSM Loods followed by a hands-on tutorial day at Xebia, run by the local PyData community under NumFOCUS. Roughly 900 attendees from data science, ML engineering and open-source tooling. 2026 keynotes include Jay Alammar of Cohere and Maarten Grootendorst of Google DeepMind on agents, and Laura Summers of Pydantic with Andy Kitchen of Cortical Labs.
- Conference 10-11 September at NDSM Loods; tutorial day 12 September at Xebia
- Joint keynote 'From LLMs to Agents and from Words to Actions' - Jay Alammar and Maarten Grootendorst
- Joint keynote 'Mothering the Machine' - Laura Summers and Andy Kitchen
- Nadieh Bremer on data visualisation as art
10–11 Sep2 days100–500
Stockholm's single-track technical conference, plus a free community day the day before.
Securityverifiedcfp closed
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
11–13 Sep3 days100–500
MetaRheinMainChaosDays, running annually since 2004, motto "Grenzen überwinden".
Securityverifiedcfp closedsold out
Three days at the Piloty building of TU Darmstadt, organised by the MRMCD association with local hackerspaces, CCC groups and nearby universities. A conference rather than a camp — a curated talk programme with workshops around it, and one of the longest-running German community security events. Attendance tickets are already sold out; the call for talks is still open.
- Twenty-second consecutive edition
- Call for participation closed 1 August 2026
- Attendance tickets sold out
11 Sep100–500
One day at Technopark Zurich — the first Swiss record in this index.
Web & Frontendverifiedcfp closed
A single-day community conference grown out of the ZurichJS meetup, at Technopark Zurich. The 2026 line-up runs to twenty-plus speakers including Daniel Roe of the Nuxt core team, Dominik Dorfmeister of TanStack Query, Mark Erikson of Redux and Kevin Powell on CSS. Community-priced and community-run rather than vendor-backed.
- Daniel Roe (Nuxt core team lead) and Alexander Lichter (VoidZero) on the Vue/Nuxt side
- Dominik Dorfmeister (TanStack Query) and Mark Erikson (Redux) on state and data
- Kevin Powell on CSS and Scott Tolinski of Syntax.fm
15–16 Sep2 days2k–10k
Repositioned for 2026 towards enterprise decision-makers, with selective visitor qualification.
Data Engineeringverifiedcfp unknown
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
17 Sep100–500
DevOps & SREofficial · partialcfp unknown
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.
18–20 Sep3 days100–500
Twenty-second edition in Dresden, motto "aufbrechen", free entry.
Securityverifiedcfp closedfree
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
18 Sep100–500
One-day regional edition of Spain's largest security congress, with trainings the day before.
Securityverifiedcfp unknown
The Valencia edition of RootedCON, the Spanish-language security congress that runs its main event in Madrid each March. A single technical day aimed at the Levante scene, with practical offensive and defensive talks from Spanish researchers and industry, plus trainings on the preceding day. Talks are in Spanish, which is the point: this is where the local research gets presented.
21–22 Sep2 days100–500
DevOps & SREofficial · partialcfp closed
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.
23–24 Sep2 days2k–10k
Free to attend, Olympia London, over 400 seminars across two days.
Data Engineeringverifiedfree
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
23–24 Sep2 days100–500
The German chapter's national application-security conference, in Karlsruhe.
Securityofficial · partialcfp unknown
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.
23–24 Sep2 days100–500
Portugal's OWASP chapter conference, two days of keynotes, workshops and a CTF.
Securityofficial · partialcfp unknown
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.
24–25 Sep2 days100–500
Belgium's hacker conference, in Mechelen rather than Ghent since the venue move.
Securityverifiedcfp closed
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
24 Sepunder 100
First local OWASP conference held in Paris.
Securityofficial · partialcfp unknown
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.
24–25 Sep2 days100–500
Twenty-first edition of the French-language web conference, and the only one that signs every talk live.
Web & Frontendverifiedcfp closed
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
24–26 Sep3 days100–500
Spain's international React and React Native conference, workshops on the Thursday.
Web & Frontendverifiedcfp closed
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
25–26 Sep2 daysunder 100
Weekend camp run by hacksaar at the HTW Saar campus.
Securityofficial · partialcfp unknown
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.
25–27 Sep3 daysunder 100
Three days in a former boiler house in Nuremberg, run by the 0x90 space.
Securityofficial · partialcfp unknown
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.
29 Sep500–2k
Bulgaria's CNCF-backed community day, capped at 600 seats.
Cloud & Infrastructureverifiedcfp unknown
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
30 Sep – 1 Oct2 days100–500
Fourth Vilnius edition, in-person only, at Kablys 2.0.
Cloud & InfrastructureDevOps & SREverifiedcfp closed
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