TL;DR There will be two lightning talk sessions You can submitt your talk here: https://cfp.cccv.de/39c3-lightningtalks/cfp Dedicated block for talks related to sustainability 5 minutes for a talk Submissions only with slides First come, first served! (The exception proves the rule.) Your chance is here! Have you always wanted to stand in front of a large audience and bring your knowledge, incredible experience, projects, ideas, hacks, or stories to the stage? Now is your chance! The Lightning Talks at 39C3 open the floodgates for you. Here are the rules: You have 5 minutes for your presentation. After that, your time is up, and you are welcome to continue philosophising with all interested creatures in your assembly, while helping out as an angle or hanging out in the lounge, but unfortunately no longer on stage :/ Theoretically, registration is open until 28/29 December.