I think his first concert was the California Jam in 1974.
I know I'm in his list 50+ times. Oddest thing I ever saw at a concert, well make that two....
Naked guy running through the infield of Anaheim Stadium during Ted Nugent. He slid on the grass in front of us and tried to impress a girl with his junk.
We were waiting for the gates of the fence outside the Swing Auditorium to open. A group was smoking a giant joint , burrito sized. They got done and one decided to climb the fence and got hung up by his arm on the barbed wired. He got off and ran off.