I was only 8 years old when the Beatles rolled into San Diego, so my hat is off to MondayMorningMarch. My parents were pretty straight (okay, extremely uptight right wingers) so I wasn't allowed to go to concerts per se as a kid.
My first real "concert" was KISS and Rush at San Diego Civic Auditorium in the summer of 75.
Edited to add: I forgot about seeing Commander Cody at the Armadillo World Headquarters in Austin in February of 75, followed by many more epic concerts at that venue in 75 through 77.
This post was edited on 12/29 at 12:28 am