The Chaos Computer Club (CCC) is inviting to the 39th Chaos Communication Congress in Hamburg at the end of December and is now asking for your ideas for lectures. You can also support the best hacker party of the year with your music and art performances and with punk.

Please read our Call for Participation carefully, before submitting ideas. It includes practical tips and guidance on how to best present your submission and how to avoid common mistakes.

We are planning presentations on four stages. We will therefore select around 130 presentations from your submissions, in the following tracks:

• Art & Beauty,
• Hardware & Making,
• Ethics, Society & Politics,
• Science,
• Security & Hacking.

Please note: We are publishing four different calls for participation today. If you submit proposals for stage presentations, music performances, art installations, or punk at our Späti, please do so via the respective calls.

The deadline for all submissions for the stages is October 24, 2025, at 23:59 UTC. We plan to notify accepted speakers by early November. 39C3 will take place from December 27 to 30.

Links:

Call for Participation: https://content.events.ccc.de/cfp/39c3/index.en.html

Submission (Pretalx) for the four stages: https://cfp.cccv.de/39c3/

Call for Art submissions (Pretalx): https://cfp.cccv.de/39c3-art/

Submissions (Pretalx) for the Music Club and the Chill Floor https://cfp.cccv.de/39c3-chaos-computer-music-club/

Call for Punk submissions (Pretalx): https://cfp.cccv.de/39c3-call-for-punk