My most memorable free concert was seeing a group perform at the Golden Gate Park. The group was called 'It's a Beautiful Day' they performed their hit "White Bird' It was a touching song with a beautiful violin lead. That was decades ago.
My first indoor Concert was at the Oakland Coleseum. Saw the Isley Brothers. An upcoming group called Graham Central Station was the opening act that night.
The most entertaining I thought was seeing Tina Turner perform at the Circle Star Theater along with B.B King and Bobby Blue Bland. The theater had a revolving stage which provided an unusual visual experience. That was in the late 70's.