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May

21-23 DORS/CLUC en in Zagreb, Croatia by HrOpen & Hulk

Take part in the Call for Participation.

23 Helvetic Ruby en in Geneva, Switzerland by Dimiter Petrov, Hana Harencarova

Take part in the Call for Participation.

23-25 Newline en in Gent, Belgium by Gent hackerspace
24-25 JdLL fr in Lyon, France by JdLL Team
28-31 Libre Graphics Meeting en in Nuremberg, Germany by Strong Type Systems GmbH
29-01 CoSin en/fr/de/it in Biel, Switzerland by CCC-CH

Take part in the Call for Participation. Deadline: 19.05.2025

30-01 Hackmeeting 0x1C online en/it by Hackers in Cagliari (Italy)

Take part in the Call for Participation (see details).

30-31 Open Hardware Summit en in Edinburgh , United Kingdom
31-01 T-DOSE nl/en in Geldrop, Netherlands by T-DOSE Foundation

June

04-06 Chaos Feminist Convention de in Hamburg, Germany by Haecksen e.V.
05-08 Flock en in Prague, Czech Republic by Fedora Project
05-07 Fediforum online en by Volunteers
07 P.I.W.O. pl in Poznań, Poland by Knyfyrtel Hackerspace Poznań, PUTrequest, Linux Academic Group
10 APELL Conference en in Warsaw, Poland by APELL
11 Capital Series Poland en/pl in Warsaw, Poland by OpenForum Europe

Take part in the Call for Participation. Deadline: 10.06.2025

12-14 DevConf en in Brno, Czech Republic by Red Hat
13-14 AtlanticaConf es in A Coruña, Spain by Grupo de Programadores e Usuarios de Linux (GPUL)
15-17 Berlin Buzzwords en in Berlin, Germany by Plain Schwarz UG
17-18 OW2Con'25 en in Paris, France
19-22 23. Gulaschprogrammiernacht en/de in Karlsruhe, Germany by Entropia e.V. - CCC Karlsruhe

Take part in the Call for Participation. Deadline: 31.05.2025

20-21 UbuCon Europe en/es in Malaga, Spain by Ubuntu Volunteers
20-21 Opensouthcode en/es in Malaga, Spain by Volunteers
26-28 openSUSE Conference en in Nürnberg, Germany by openSUSE project

July

01-03 Pass the SALT en in Lille, France
01-05 HOA25 en/de in Gifhorn, Germany by Stratum 0 e.V.
05 Tübix de in Tübingen, Germany by Tübix e.V.
14-20 FOSS4G Europe 2025 en in Mostar, Bosnia and Herzegovina by OSGeo, Ecoplan, University of Mostar

Take part in the Call for Participation.

14-20 DebConf '25 en in Brest, France

Take part in the Call for Participation. Deadline: 19.05.2025

15-20 Fedicamp en/de in Gedelitz, Germany by No OU.
16-23 Bornhack da/en in Funen, Denmark

Take part in the Call for Participation.

17-20 VVoid Camp en/de in Perlesreut, Germany by hinterVVoidler e. V.
24-27 SeeZeit 2025 de in Mainhausen, Germany by Chaos Computer Club Frankfurt e.V.
24-29 GUADEC en in Brescia, Italy by GNOME Foundation
26-27 TDF4 de in Tübingen, Germany by Chaostreff Tübingen (CTT)

Take part in the Call for Participation. Deadline: 29.06.2025

August

08-12 why2025 nl/en in Geestmerambacht, Netherlands by IFCAT

Take part in the Call for Participation. Deadline: 25.05.2025

13-15 GopherCon UK en in London, United Kingdom
16-17 FrOSCon 20 de in Sankt Augustin, Germany by FrOSCon e.V.

Take part in the Call for Participation.

19-21 Scaladays en in Lausanne, Switzerland
21-25 Hack'n'Sun de in Bonn, Germany by Teckids-Gemeinschaft
22-29 ConTeXt meeting en in Chmielno, Poland by context group, Ryszard Kubiak
28-31 WAMP de in Rotenhain, Germany by Westwoodlabs e.V.
28-31 Cebulacamp en in Wrocław, Poland by Polish hackerspaces

September

02-07 End Summer Camp it in San Dona' di Piave, Italy by SM4X
05-07 InselChaos 2025 de in Bergen auf Rügen, Germany by Port39 e.V. Stralsund

Take part in the Call for Participation. Deadline: 01.07.2025

06-11 KDE Akademy 2025 en in Berlin, Germany by KDE e.V.
08-12 preCICE Workshop en in Hamburg, Germany by preCICE team

Take part in the Call for Participation. Deadline: 31.05.2025

09 pgDay UK in London, United Kingdom by PostgreSQL Europe
12-14 MRMCD online en/de by MRMCD e.V. in Darmstadt (Germany)
17-19 Open-Access-Tage in Konstanz, Germany by Organisationsteam
18-20 DrupalCamp Spain 2025 es in Santiago de Compostela, Spain by Drupal Community
19-21 BalCCon2k25 en in Novi Sad, Serbia by LUGoNS
19-21 Hacks on the Beach 2025 en/de in Flensburg, Germany by Chaos Computer Club Flensburg e.V.
19-21 Datenspuren en/de in Dresden, Germany by Netzbiotop Dresden e. V.

Take part in the Call for Participation. Deadline: 15.08.2025

20 Software Freedom Day
23 Open Tech Day en in Nuremberg, Germany by NETWAYS Event Services GmbH
25-28 Hackmeeting 2025 en/es in Zaragoza, Spain by Hackers
26-29 Freedom not Fear en in Brussels, Belgium
30-01 All Systems Go! en in Berlin, Germany

Take part in the Call for Participation. Deadline: 13.06.2025

October

03-05 Festa do Software Livre pt in Porto, Portugal by Associação Nacional para o Software Livre
04-05 LinuxDays 2025 cs/en in Prague, Czech Republic by FIT ČVUT
08-10 Penpot Fest en/es in Madrid, Spain by Penpot Team
23-25 Distribits 2025 en in Düsseldorf, Germany
25 Linux Day en/it in Palermo, Italy by Sputnix.it

Take part in the Call for Participation. Deadline: 15.09.2025

31-02 eth0 nl/en in Someren, Netherlands by Stichting eth0

Take part in the Call for Participation. Deadline: 01.10.2025

November

01-02 OpenAlt cs in Brno, Czech Republic
07-08 SFSCON en in Bozen, Italy by NOI Techpark

Take part in the Call for Participation. Deadline: 30.06.2025

09-11 DENOG17 en/de in Essen, Germany by DENOG e.V.
10-11 Open Science Days in Berlin, Germany by Max Planck Digital Library
18-19 OpenForum Academy Symposium 2025 en in Rio de Janeiro, International by OpenForum Europe

Take part in the Call for Participation. Deadline: 01.06.2025

18-20 Open Source Monitoring Conference en/de in Nuremberg, Germany by NETWAYS Event Services GmbH

Take part in the Call for Participation. Deadline: 30.06.2025

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