on a damp night in '69/'70 i attended ( hi, Joy! ) a small birthday celebration for " big daddy " at pacific high. the event was simulcast, i suppose on ksan. tom was wandering about, in & out of the engineering booth. the performers were stoneground & the new riders. this was several years before pigpen's demise. there were no risers or anything, just carpets on the floor, a lot of dancing, etc. it was a blast, of course. is there a recording extant? any other participants care to chime in?