Me me me!  The day after my junior high graduation.  This sheltered 13 yo from the 'burbs saw a lot of new stuff, let me tell you!  Nobody played when they were scheduled; we were there to see CCR and they played, I think, early the next day.  We sat on the roof and listened to Hendrix, IIRC, on Saturday night. I think my 1-day ticket might have cost $4 or $5.  (We picked the first day because we had an inkling that we wouldn't be allowed to go once it was in the news!)

There is a poster that's been on ebay forever which lists all the performers; I wish I still had the tear sheet from the LA Times that was on my college dorm room wall.