I'm embarrassed to say it, but The Monkees, in 1967 I think. I had dated this guy, broken up on friendly terms, and he had a new girlfriend who didn't feel well the day of the show. He asked me and we went as friends, even though neither of us was much of a fan. (His girlfriend was.)
For a lot of years after that, money was tight enough that faced with the choice of three to five albums or one ticket, I'd buy the recording and get many more hours of musical pleasure. Only now am I seeing the great bands of my youth. Styx still puts on an excellent show. Journey's new front man is... weird, although he can really sing. He doesn't fit the band. The Stones still got it. Yes has no stage presence whatsoever. Herman of Herman's Hermits is a surprisingly good showman.