Breakouts at a conference mostly don't matter unless it's something you're especially interested in or know the speaker. At FOSDEM they're recorded anyway--not that you'll get around to watching the recordings.

Speaking of conferences, this is one thing I loved about the Monitorama conference in Portland. It has a single track, so everyone attending the conference goes to all the same talks, which means you now have something in common with everybody in the hallway track and post-conference events to talk about.

("Loved" because I haven't been in years -- the conference is, AFAIK, still going strong.)