BlizzCon 2011 Girl Costume

On February 17, 2009, Blizzard announced their fourth BlizzCon, taking place again at the Anaheim Convention Center on August 21 and August 22, 2009.
In an attempt to reduce frustrations linked to lack of ticket availability for previous BlizzCons, there were to be four halls (increased from three) of space available.
Tickets went on sale on May 16 and May 30, 2009. For this batch of ticket sales, Blizzard implemented an entirely new system designed to make buying BlizzCon tickets much easier than the previous year. The new system implemented an online queue, effectively creating an organized online "line" for anyone who wants to purchase tickets, an improvement on 2008's chaotic sale of Blizzcon tickets. The ticket queue system worked much more fairly during both the May 16th and May 30 sales though many did not get tickets due to quick sales time. There were, however, a number of browser related issues that caused a number of people to be unable to purchase tickets. For many, their queue stayed at the same spot no matter how long they waited, and others noticed their queue go up, effectively keeping them at the end of the line and preventing them from purchasing tickets. Blizzard also created a new flash game "Failocallypse" to play while waiting in line.
Blizzard announced on August 11, 2009 that Ozzy Osbourne would perform live during the 2009 BlizzCon closing ceremonies.