Respected and revered commentator Corry342 (proprietor of Lost Live Dead* and Hooterollin’, two of the greatest Dead sites on the Innertubes) points us to the San Francisco Chronicle’s slideshow of 9/28/75, and you need to check it out.
The show was a double, the Dead and Jefferson Airplane, but no recording of the Airplane exists and only a few pictures. Nowadays, of course, there would be reams of shots, too many to wade through, but it was a different time.
Saigon had fallen less than six months earlier.
*Go check out Lost Live Dead and read the brand-spanking new goodness about the ’76 Day on the Green with The Who. Seriously: go. His stuff’s better than mine.