If you still aren’t convinced, you can watch this video
http://vimeo.com/osgeo/foss4g2011 from the local committee with a personal appeal, and insistence, that you come to FOSS4G in Denver.
FOSS4G is the global conference focused on Free and Open Source Software for Geospatial that is organized by the Open Source Geospatial Foundation (OSGeo) with support from an all-volunteer organizing committee and professional conference management from the Geospatial Information Technology Association (GITA). The 2011 FOSS4G event in Denver marks the first North American event in four years, with the prior three events taking place in Barcelona, Sydney and Cape Town.
The 2011 FOSS4G Organizing Committee