Thanks TJ for the suggestions -- Mike, Tracy and John are all actively involved in the making of this documentary film, and Tom Paley has been filmed and interviewed. I've been in touch with various Ash Grove folks (both people who were involved with running the club "back in the day" and others who were just hanging out). Sam Hinton actually is living in Berkeley (where I am located) and I will contact his family -- he occasionally comes out to various music events which is wonderful to see.
Suzy