FOSS4G is the acronym for Free and Open Source Software for Geospatial. It is the annual recurring global event hosted by OSGeo since it’s inception in 2006.
The OSGeo Conference Committee is the steadying factor of FOSS4G over the years. Organization of FOSS4G starts roughly 2 years in advance as the venue rotates around the world when a call for bids is sent out.
All the hands-on ground work is done by a volunteering Local Organizing Committees that form each year and have so far always excelled themselves at putting together a great conference.