Through work in sports, had the opportunity to meet a LOT. It was kinda wasted on me as I was never one to see pro athletes and celebs as anything more than just other people. Still some cool stories to tell though.
Keeping to six... Ben Crenshaw, Kareem, Rod Laver, Sammy Sosa, Michele Smith, Tony Gwynn
It was wasted on my wife as well... anticipating that I would be entertained by her answer, I just asked her what famous people we had met. "The golf guy, the tall basketball guy..." Well, Ben Crenshaw spotted us carrying our 1 yr old (now 35) in a backpack at one of the Shark Shootout events and he came over and shook his hand and spent quite a bit of time talking to us. We ended up in an elevator with Kareem at one of the NBA All Star games and he talked to us quite a bit as well. I had lunch with Rod Laver and he had tons of amazing stories about professional tennis in the early days. Got to go to a Danny Gans Vegas show with Michele Smith and she is every bit the naturally pleasant person she seems to be with her broadcasts. Sammy... well... yeah he is what he seems to be as well .
I also attended a private baseball Fantasy Camp that had a long list of the greatest from the 70's thru 90's and most were very accessible for long periods of time. I broke a bat hitting against Vida Blue and still have it somewhere.
OK, over the limit but one more. I was invited to be part of the on-field presentation for one of Barry Bonds' Gold Glove awards but passed because we were celebrating something for my wife. I may or may not have mentioned that to her as leverage over the years.