Big Al's Gashouse was a pizza-and-beer joint, affiliated with similarly named places in North Beach and around the Bay Area (there really was a "Big Al"). Big Al's was another pizza place, like The Tangent or Magoo's, but at least it was connected to the City, if not really part of it.
The exact date of the Warlocks gig (or gigs) is unknown, but
McNally and Jackson (in The Illustrated Trip) place it in August 1965.
Big Al's Gashouse burned down in January 1966. It was eventually replaced by a suburban hipster bar called The Trip, which opened in November 1966, but by that time the Warlocks were very far past that road.(1)
Jerry performed here in
1.)^Arnold, Corry, Lost Live Dead, 2009-09-06, North To San Francisco, http://lostlivedead.blogspot.com/2009/09/north-to-san-francisco-warlocks-in.html