Your First Concert was.....

Not mine, but my 14 year old son.
Kansas concert. Met Robby Steinhardt (violin) at a friend's house, he went to sound check with him. Backstage pass, 3rd row seats, more backstage, and partied with the band at friends house after.

Now that's an introduction to rock and roll!

Led Zepplin, Macon City Auditorium 1969
Warren, I'm sincerely jealous-Woodstock?

My First concert in front of big audience I performed when I was 11 playing Vossil's Flick-Flack on Accordion on the talent show. It was not successful though and I didn't get to go next round. When I heard my recorded performance, I realized my glitches, but decided not to go further with practicing and quit:(
Here's another sloppy example very similar to mine used to be back than
https://www.youtube.com/watch?v=rGFttTwBhDY

1968 at the Fillmore West in S.F. I saw Deep Purple, It's A Beautiful Day and Cold Blood (Deep Purple was actually 2nd billing!). I was about a month away from my 16th b'day. The following week I went again to see The Jeff Beck Group and Spirit. Both concerts were enhanced via psychedelic drugs, which was the thing to do back then when you went to the Fillmore.

Dragon, thanks for the tidbit about the psychedelics at the Fillmore, would never have guessed...