BlizzCon is a Blizzard Entertainment-hosted gaming convention.
A cinematic trailer was shown at BlizzCon; it is a longer version of the trailer shown earlier in the year at E3.
On the 12th of April 2007 Blizzard announced that they will be holding a second convention that year. This convention was held on August 3rd 2007.
On May 12th, 2008, Blizzard announced their third BlizzCon event gaming convention, to be held at the Anaheim Convention Center in Anaheim, California on October 10 and 11. In response to the demand to accommodate more attendees, that year's event expanded from two convention halls to three.
BlizzCon 2009 was held in Anaheim, California August 21st and 22nd 2009.
BlizzCon 2010 was held in Anaheim, California on Friday October 22nd and Saturday October 23rd, 2010.
BlizzCon 2011 was held in Anaheim, California on October 21st and 22nd, 2011.
There will not be a BlizzCon 2012, as Blizzard's tight production schedule of Heart of the Swarm, Diablo III and Mists of Pandaria made such an event prohibitive. The next BlizzCon is set to be held in 2013.