I think it was April 1970. At the Janis Joplin concert at what is now called Diablo stadium. That's Ron Harris (aka Papa Eric on KCAC) on the left, and yours truly Marty Manning in the flag shirt. We were doing a really dumb comedy routine as the Captain America Repertory Company (Chapter 2). Bob Gately was the promoter, with the James Cotton Blues Band as the opening act. I met Janis briefly backstage and she gave me a shot of her Southern Comfort with a bite of her apple as a chaser. A few months later, she was gone.
Thanks to Tom Story for the photos