I think it was this one. I was 15 and had to go w/ my uncle who was wearing a plaid jacket and corduroy and looked like he stepped out of a cocktail party in fox hunting country. I was from Virginia and had never seen hippies before. I was embarrassed because my uncle looked completely out of place. Pigpen wore a full robe and a headband. The place was small the band took up almost the full width, so most people were on the sides. There were even tables to sit at. They were intense - playing hard - and seemed to play very fast. I remember Viola Lee Blues. The climax was awesome - much better than the record (had it just come out?).