Blizzcon is Blizzard's own gaming convention. It's been held several straight years in the Anaheim Convention Center, just a few miles from Blizzard's offices in Irvine California. Each year Blizzcon offers numerous panels presenting information about the various Blizzard titles, as well as huge areas full of machines with their newest games in playable demos. Tens of thousands of fans attend Blizzcon, often dressed in their Cosplay best.

See the individual year articles for more details on what each Blizzcon demonstrated in terms of new Diablo III information.