Which concerts would you like a "do over" for?

Great question Shades. It would probably be Grand Funk Railroad. I went with friends but wandered around alone during intermission and next thing I knew I heard someone introducing the band so I had to hurry and find a seat and watch it by myself. I still couldn't find my friends after the show but at least I found another lost friend (that didn't come with us), so he bummed us a ride from some strangers in a van. I can't even remember who the opening act was but it was probably someone good. I imagine there would've been less sporadic adventures in my life if we had cell phones back then.