The Closing Ceremony by Blink 182, in California near where they are from while be utterly amazing. The ability to see the expansion of Reaper of Souls for Diablo will be very entertaining and the introduction of the new class. Also, after 7 years of WoW, very excited to see how the Weapons from Garrosh will be incorporated into the next Expansion. Finally I think the Method vs. MidWinter Live raid will be amazing and competitive.
I'm looking forward to the World of Warcraft panel. I'm EXCITED to see stuff for the next expansion. I've never been able to go to blizzcon. I've only watched it from home. I'm really hoping I win! ;D
The panel I'm most excited about is definitely the "Diablo III: Gameplay Systems + Crusader" because I've always wanted to play as a knightly type of hero in Diablo 3, and I'm also really looking forward to all the new features that's being released for Reaper of Souls.