It was my first real rock concert too! I had seen the Osmond family in concert a few times before when they perfomed at amusement parks, but it was my first REAL rock concert.
Our seats were on the field, (venue was Reynolds Collisium) so I was using the portapotty when I heard Mick start "Start Me UP!" I flew out of that thing! They actually started early. I ran out zipping up. lol We danced the entire thing. Those guys wore me out and I was in my 20's at the time! Very memorable.