okay update they are very anal about copyright this year because of the german "GEMA" bullsoykaf (google it). two stages declined to offer us their place because of this.
BUT found a stage to go to, they asked about time, told them 1am. Apparently they're expecting a flashmob in ~2h there and running around with their hair on fire already. Told me to come back at midnight to ask again and probably it would be okay.
Freifunk stage here:https://35c3.c3nav.de/l/oio-arena/@0,447.09,404.81,5
However, my laptop has no HDMI, so I need to find someone who lends his laptop for the screening.