Well I worked backstage security at a major MA music venue back in the mid 80's so I met and partied with a few:
U2-was a bodyguard for Bono and the Edge (yep all 113 lbs of me..at the time!) Both so awesome and nice. Loved them
Ozzy Osbourne- was really drunk
Gerry Garcia and the Dead- had beers and a smoke

at the local Marriott bar...very cool night (oh those days of youth!)
Martin Mull-from Sabrina the Teenage Witch. I worked in advertising and he was in one of my client's TV commercials.
Now I'm pretty boring!