Throughout my late teens and early twenties, I was traveling and didn't have any opportunities to go to concerts (I don't think anyone was interested in booking a concert in Saudi Arabia
).
After settling back in the states, the first commercial concert I ever attended was Ozzie Ozborne with Survivor opening. Ozzie had a great show although I kept waiting for him to bite the head off of something. Alas, he never did.
Stormie