Conventions

Gen Con Conventions
Offers gaming conventions in Europe and the United States. Site contains information on each location.
http://www.gencon.com

UberCon
Produces gaming conventions worldwide for in-person competition and social opportunities. Contains date calendar, registration, information on the games played and the people involved, and hotel locations.
http://www.ubercon.com/

Wikipedia: Gaming Convention
Offers information about what goes on at a convention. Also lists different conventions.
http://en.wikipedia.org/wiki/Gaming_convention