The postcard was first printed after the concert with the 2nd printing of the poster, has a "West Coast Lithograph" credit on the reverse and measures 5 1/8" x 8".

The post-concert 3rd printing presents a "Creative Lithograph" credit on the reverse and also measures 5 1/8" x 8". Some of these 3rd printings have a blank reverse.

When the Avalon Ballroom and Bill Graham's Fillmore Auditorium began to hold weekly dance concerts, Wilson was called upon to design the posters. He created psychedelic posters from February 1966 to May 1967, when disputes over money severed his connection with Graham. Wilson pioneered the psychedelic rock poster. Intended for a particular audience, "one that was tuned in to the psychedelic experience," his art, and especially the exaggerated freehand lettering, emerged from Wilson's own involvement with that experience and the psychedelic art of light shows.