BlizzCon
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From Diablo Wiki
BlizzCon is an annual convention hosted by Blizzard and held in the Anaheim convention center. The first BlizzCon was held in 2005. Others followed in 2007, and 2008. The convention has been larger each year, and more than 12,000 ticket sold out in less than an hour when the 2008 convention sales page went live.
See the BlizzCon 2008 page for more details about the 2008 installment, which introduced the Wizard and first showed off a playable version of Diablo III.
See the BlizzCon 2009 page for more details about the 2009 show, which introduced the Monk.