The annual Free Open Source Developers European Meeting 2013.
For more information visit http://fosdem.org
But was is the FOSDEM exactly?
The FOSDEM is a place where a bunch of 5000+ geeks meet together at the ULB Campus Solbosch in Brussels. At the FOSDEM you will find various different rooms where peoples present some open source product or topic. You can watch and listen to what they have to say. To resume, it's a promotional meeting where people promote their lovely open source spirit. It's not a training event or somethings like that. You can also take your LPI exam on the event, but take note that you need to make your reservation for this. At the FOSDEM you will find a few stands where you can buy you lovely geekish t-shirts. There's also some food and drinks stands. If you're in an open source spirit, the FOSDEM is a place to go!