Your first concert was to see who and when?

The Beatles at Shea Stadium 1965.

Black Sabbath’s Heaven and Hell tour (Ronnie James Dio’s first, I believe) at the Jacksonville Coliseum in 1980ish.  I was 15 and somewhat bowled over by the whole thing. 

Wow, these are some amazing time machine fantasies.  I was either not born yet or waaay too young for most of the classic rock ones.

My first was Joan Jett, Ministry, Flock of Seagulls, and The Fixx all opening for The Police, Comisky Park, July 1983.  I remember spending a lot of time trying to avoid pot smoke.  How ironic. 

Rush, Hemispheres, Victoria BC, Nov 2, 1978 (I was 14)

ELO at the Anaheim Convention Center in So.CA.  I believe it was 1976 or maybe early 77.  I was especially blown away when they did Roll Over Beethoven!   Couldn’t believe when the cellist were laying on they’re backs playing using they’re feet to hold the cello up in the air.  Was so good I can still see it.  
I think I saw Dave Mason shortly after that.  Would have been right after the Dave Mason Certified Live album came out.  In his prime then!