(late rough draft of memory: remember this part -- "The promoter was a friend of mine and had asked me to invite the performer to a party after the show ... ?")
Update:
The promoter, a BMW-riding fashioner of verse who bore a remarkable resemblance at the time to the Jean Paul Belmando of imported films, got hooked on promoting concerts. Within a few years, he opened a rock palace called "The Hippodrome" far to the south. During that period, he also scripted a film with the Viet Nam war as a backdrop. The film went into production, was completed, and for whatever reason simply disappeared from sight. The film existed only in some historic archive in a San Francisco museum until just recently. A few musicians I knew in those old days were recommended and they provided music for the soundtrack. I never did see the film.
captain milkshake