Here's the schedule for tonight, from CNN:
The highlight should be Barack Obama, a state senator from the south side of Chicago running for an open Senate seat in Illinois, a shoo-in to win at this point given the Republicans don't have a candidate. (Their candidate had to drop out when it was revealed he allegedly took his wife to sex clubs. Then Mike Ditka thought about it, but declined.) Obama is said to be bright, charismatic and connects with people of all stripes, from profiles we've read.
He's the keynoter.
Here's a NY Times profile.