George W. Bush(though that might ruin the dinner. So many people hate him)
Karl Rove or Dick Cheney(for someone needs to pull the president's strings)
George Harrison
Al Pacino(even though he's quite shy, so I hear)
Prof. Michael Nagler(better conflict mediator, especially since a lot of feisty people will be at the dinner)
All 5 members of the Rumours line up of Fleetwood Mac(sure will be interesting. Instead of going at each others' throats, they might just aim at Bush)

However, if Christine McVie doesn't want to come, I'll have in her place John Kerry, for it might be interesting to see winner and loser sit together.