FOSDEM '10 is a free and non-commercial event organized by the community, for the community. Its goal is to provide Free and Open Source developers a place to meet.
Official Website: http://www.fosdem.org/2010/
Added by petef on July 17, 2009
The fosdem organizers have posted information for people wishing to come with their partners : http://www.fosdem.org/2010/bring-your-partner