WordCamps are casual, locally organized conferences covering everything related to WordPress.  The first such event was WordCamp 2006 in August 2006 in San Francisco , which lasted one day and had over 500 attendees.   The first WordCamp outside San Francisco was held in Beijing in September 2007.  Since then, there have been over 507 WordCamps in over 207 cities in 48 different countries around the world.  WordCamp San Francisco 2014 was the last official annual conference of WordPress developers and users taking place in San Francisco, having now been replaced with WordCamp US.