Description FOSDEM (Free and Open Source Software Developers' European Meeting) is a free event offering open source communities a place to meet, share ideas and collaborate. It is renowned for being highly developer-oriented and brings together 5000+ geeks from all over the world. No registration necessary.
Venue ULB Campus Solbosch
Mozilla traditionnaly have both a booth and a "developer room" where conferences are held.
More info on the wiki: https://wiki.mozilla.org/Fosdem:2013