Origins International Game Expo
The Origins International Game Expo is one of the largest and longest-running game conventions in the world.
For information on Origins see: http://www.originsgames.com
Origins plays host to the Cthulhuthon, where much Cthulhu can be enjoyed by all.
During the GAMA run through 2004, Rogue Cthulhu ran many Call of Cthulhu events and oversaw the Cthulhuthon (introduced in 2004).
In 2005 and 2006 The Shoggoth.net Group was responsible for overseeing the Cthulhuthon.