Pitchers-
Paige
Wood, Johnson, - really any of the greats from that era.
In person rather than on TV
Tiant
Ryan
Marichal
In their prime-
Feller. I saw him pitch a HR derby in 74 or 75 and he had more pop than the minor leaguers in either game of the double header.
Hitters-
I saw a bunch of the late 70's AL guys, and a few since.
Gibson
Mantle
Ruth
Gehrig
Cobb
Williams
Kingman for a full season in Fenway- Never happened for even a few weeks
I havent attended much for other sports, seeing any of the all time greats would be great. Especially Merckx and Pele.
Non sports.
Hendrix - pretty much any part of his career
Led Zeppelin
The Who
Beatles
Stones
Those 4 only in their prime. I know I can still see the stones, but they should have gracefully moved into a retirement home 20 years ago. Missed the Who by just a little in 1981, a deal for tickets never came together.
Annie Oakley
PT Barnum
Plus a whole bunch of people I'd like to see in action as an observer or just meet for an hour or so. Historical figres like Ghengis Kahn, Patton, Alexander, Gandhi....
Steve B