My roommates dragged me to a Jefferson Airplane concert, probably in 1971, at one of the SUNY locations. It was held in a large room with a stage at the front, not an auditorium per se — a surprisingly modest venue for an internationally famous act. One of my roommates was a huge fanboi. We arrived very early, and before going in, we drank a bottle of wine. When doors opened, there were chairs set up, but my companions wanted to be as close as possible so we sat on the floor in front of the stage. I don't remember if there was an opening act. For most of the evening, I desperately wanted to pee, but there was no opportunity. One of the performers (Jorma Kaukonnen) wore a huge swastika around his neck, but my Jewish roommate didn't seem to care. At one point, all the performers left the stage except the drummer, who drummed for several minutes. For me that was extremely boring.
Needless to say, I hated the experience, but my roommates were very chuffed.
Later I told somebody about this, who replied that to understand the Jefferson Airplane's music, you had to have previously tripped on acid. I never went to another rock concert. I've been to other sorts. A few years ago, I saw an Il Volo concert because my MIL liked them. Now that I think about it, I also saw a Burt Bacharach concert in 1972.