October 22, 1969 Family Dog on the Great Highway, San Francisco "Ecological Ball" with Lazarus/Garden Of Delights/Heavy Water/New Riders Of The Purple Sage and films
This show had been known from an obscure flyer, but this listing in the Wednesday, October 22 Chronicle sheds slightly more light on the event. Only the Riders and Lazarus were rock bands, as Garden Of Delights and Heavy Water were light shows. The evening sounds like what today would be called a "multi-media" event. The Riders probably played one set.
Lazarus was a popular Berkeley band, although they were not well known outside of the East Bay.