The initial allotment of tickets for BlizzCon 2010 has now been sold out. If you weren't able to get tickets this time, you'll have another chance on Saturday, June 5 at 7 p.m. (10 a.m. Pacific time), when a second batch goes on sale. Coverage of the gaming festival will also be available as a Pay Per View multi-channel Internet stream -- keep an eye on BlizzCon site for more details in the near future.

http://eu.blizzard.com/blizzcon/