Black Mountain Boys date

I don't really do pre-Dead, but I found this, don't see it at JGC, don't know where else there might be show lists for pre-Dead bands, and thought I might as well put it here.

The "Marri-Eds" sponsored a hootenanny at the Santa Cruz Civic Auditorium on March 25, 1964, featuring The Couriers, Lino with his Latin and American Folk Songs, the Black Mountain Boys from Palo Alto, and Bill Helm from the San Francisco Bay Area.