Quite a few of #deltachat #chatmail and #webxdc folks are already and will be around #39c3 -- on-site you can join a group chat (or send us a DM upfront) where we announce dynamically scheduled sessions. You'll find us mostly around Komona but also other places ... for more info:
PSA: Influenza is spreading heavily currently, and 30% of people are infectious without symptoms. Please maintain hygiene and at best test yourself before entering premises. Thanks!