BlizzCon is a video game convention held by Blizzard Entertainment to promote its major franchises Warcraft, StarCraft, Diablo, Heroes of the Storm and Overwatch. The first BlizzCon was held in October 2005 at the Anaheim Convention Center in Anaheim, California in the US where it has been held ever since.
The convention features game-related announcements, previews of upcoming Blizzard Entertainment games and content, Q&A sessions and panels, costume contests and playable versions of various Blizzard games. The closing night has featured concerts by The Offspring, Tenacious D, Foo Fighters, Ozzy Osbourne, Blink-182, Metallica, and Linkin Park.
A similar event is the Blizzard Worldwide Invitational, which has been held in countries other than the United States, however this event has not been held since 2008.