The Tribute to Chet Helms. Saturday April 30th 1994. Maritime Hall, Harrison Street, San Francisco, California. Party at 6 to 7, show from 8 til well after midnight. Artwork by Chet Helms. The New Riders of the Purple Sage. Squid Vicous of Journey. Big Brother and the Holding Company. Lights by Bill Ham and more. Artwork by Alton Kelley, on this poster most the bands hadn’t been announced yet when it was printed. This first printing poster was printed before the show and is near mint. 11 3/4 x 16 1/2 inches. We are here to make people happy, thank you for your business.