Well he already went to a Killers concert this year when they were in Chicago during the first leg...many reported his dancing and singing along to Jenny Was a Friend of Mine...though he did not go on stage...
Bring this thread back to life. Ace Frehley instead of Bono got on stage with Pearl Jam at Borgata #2, and Eddie sang with Slater Kinny "Promise Land" and by himself "Atlantic City" to open up the show with.