This poster is known as “The Week of the Angry Arts,” and actually says on the poster, “Spring Mobilization to End the War in Vietnam.” It was the spring of 1967, “Make Love Not War” was the mantra, and the Bay Area’s best came out for this protest show: Big Brother & the Holding Company with Janis Joplin, Quicksilver Messenger Service, Country Joe & the Fish, Sopwith Camel, and as a last-minute added attraction, the Grateful Dead. Enthusiastically discussed by collector Pete Howard of PosterCentral.com (phone 805-540-0020, email pete@postercentral.com). If you covet 60s psychedelic concert posters like this, be sure to view more of them on this page of my web site, which you’re on right now: http://www.postercentral.com/psychedelic.htm