Oops, I was a little bit off! It was the Village Theater which became the Fillmore East (Anderson Theater was down the block).

Now the Handbill at WV under Blues Project stuff says it was Chrysalis, Richie Havens, Blues Project, and the Who. The lights were by After the Third World Raspberry.

Now I'm sure that the Rich Kids opened the show (unadvertised). I'm no longer sure that Mountain performed - I might have a warp in my memory. The date was July 1967.