I'm guessing it was 1979 at the Spectrum in Philadelphia. My brother who was (and still is) 5 years older than I am somehow got tickets. I was 11 and he was 16. Anyway, he tells me he got 2 tickets and I was beside myself. I simply could not fathom the greatness and grandeur I was going to get to see. And I tell everyone I am going and got the Ok from Mom and Dad. It was all perfect up until a few days from the show. My brother tells me he is going to take a buddy of his instead. I still feel the pain from that.
My Mom explained that I was just too young and he wanted to be with a friend more than me. And for whatever reason that made sense to me. He wanted to see the show with a friend and not have to drag his lame 11 year old brother around... or be responsible for me.
So just him giving me the details was still good enough to make it my favorite show. It was kind of a special place in time for my fandom of Kiss. I never have seen them but perhaps my memory of 'what it was' is better to have.