BG026 is Wilson's first poster to incorporate a nude portrait of his wife Eva, although the unclad female form would soon become a recognizable feature of his work. Motown legends Martha and the Vandellas were a new addition to the San Francisco fare of The Jefferson Airplane and The Grateful Dead.
The 1st time the postcard was printed, named 2nd printing A, was with the second printing of the poster after the concert. The reverse bears a "West Coast Lithograph" credit, and it has a 1 1/8" border above and a narrow border below the image. It measures 5" x 8 1/4".
The post-concert 2nd printing B has a 1 1/8" border below the image and a narrow one above with the "West Coast Lithograph" credit on the reverse. It measures 5" x 8 1/4".
The post-concert 3rd printing has top and bottom borders that measure less than 1/4". The "West Coast Lithograph" credit appears on the reverse, and the card measures 5 1/16" x 7 1/2".
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.