"BlizzCon" is a convention held by Blizzard Entertainment to celebrate their major franchises: Warcraft, StarCraft and Diablo. The 2010 convention, featuring a live performance by Tenacious D, was held on October 22–23, and the 2011 convention, which featured a performance by the Foo Fighters, was held on October 21–22.

BlizzCon first started in October 2005, held at the Anaheim Convention Center where it has been held since. Some features included the announcements of release of new content for their franchises, previews of content for upcoming games, and Blizzard developer Q&A sessions.

Throughout the days are hands-on experience of new,existing and the old games, various panels related to the multiple franchises, and judging of the contests being held - including costume and songwriting. The closing night has held a concert, previously The Offspring and Blizzard's in-house band (whose members are employees) Level (10, 60, 70, 80 or "The Artists Formerly Known as Level 80") Elite Tauren Chieftain.