john hoffman at six gallery
At the Six Gallery reading (http://www.litkicks.com/BeatPages/page.jsp?what=SixGallery), one of the six readers, Philip Lamantia, read the poems of John Hoffman (who had already died before this time) instead of his own. I don't know much else about this guy except that Ginsberg and Lamantia obviously thought highly of him.
Mexican volcanos also seem to be a recurring Beat theme. Allen Ginsberg also once had an adventure with one, which makes an interesting chapter in his biography.