You too would have liked to follow 5+ conferences simultaneously at #FOSDEM? For next year: you can get the #FOSDEM videos during the event by recording them yourself with fosdem-recorder .
That way you can watch the conferences you missed, as soon as the first day is over (and play them back in x2 speed), just after the beer break :-)
P.S: don't overuse it though, and be aware that the "official" videos are usually uploaded a few hours/days after the conference.