Here's what Gianmaria wrote:
A couple of 1979 papers include some reference to Yochk'o Seffer as he was touring with New York Gong and Mother Gong on the Spring 1979 bus tour of the U.S.
A scan of the flyer for the Lawrence Opera House Manifestival on May 6th. Lol Coxhill was announced, but didn't play. Rick Chafen sent me the original flyer; he was early Voiceprint US man and promoter for several Allen and Gong family American tours.