It's great, but it has to be said there were too many rooms with "Full" signs and queues outside. To misquote Jaws, I think we're gonna need a bigger venue.
Edit: In retrospect this kind of sounds bad. ULB donates this huge campus for free which is a wonderful thing. Perhaps there is a better way to allocate speakers to rooms so that speakers with expected larger audiences are assigned to the largest rooms. An application for AI maybe?
Just poll which talks the audience wants to see beforehand. Works fine for the Chaos Communication Congress. The one room per track concept of FOSDEM doesn't provide much of a practical benefit AFAICT.
I think it's worth keeping in mind that the devrooms are run very autonomously by the corresponding communities. I actually spend full days in a single devroom, and get the most out of FOSDEM that way. But I can also see how it's different for many people.
For KubeCon + CloudNativeCon, we use sched.com for scheduling and ask people to select their talks ahead of time. Then, we can move talks between rooms based on interest. Of course, this assumes that the people who select their interest ahead of time are somewhat representative of all attendees.
Edit: In retrospect this kind of sounds bad. ULB donates this huge campus for free which is a wonderful thing. Perhaps there is a better way to allocate speakers to rooms so that speakers with expected larger audiences are assigned to the largest rooms. An application for AI maybe?