The Avalon's weekend ran Friday through Sunday, and September 3, 1966 was the closing night of the Family Dog's booking on Mouse and Kelley's FD-24 — the "Tree House" sheet, a bird's clawed foot lifting an airborne cabin out of a tangle of root and vine, printed on vellum.

The bill was the 13th Floor Elevators over the Sir Douglas Quintet: two Texas bands on a San Francisco poster. The Elevators had come from Austin with the whole psychedelic apparatus already assembled — Roky Erickson's voice, Tommy Hall's amplified electric jug running under everything, and an album that had put the word "psychedelic" in its title before the Bay Area had settled on a vocabulary. Doug Sahm's Sir Douglas Quintet, second-billed, had charted the year before with "She's About a Mover" and relocated to California.

It is the second night of a two-night stand that this chronicle told from its opening on September 2 — the night the Elevators finally turned up in San Francisco, six days after being advertised on BG-25 at the Fillmore and not appearing at all.