The 2010 World Series of Poker begins this Friday 5/28. Day 1 kicks off with the smallest buy-in event ($500 casino employees) and the largest event ($50K 8 game mixed). The full schedule and structures are linked here.
Other competing tournament series going on in Vegas are:
The Orleans Open: 5/22-5/30
Binion's Poker Classic: 5/26-7/11
Caesars Mega Stack: 5/26-7/15
Venetian Deep Stack Extravaganza: 5/28-7/15
Golden Nugget Poker Series: 6/5-7/4
Bellagio Cup: 6/25- 7/16
Aria Poker Classic: 6/27-7/17