4-3/16x7-1/8" postcard for Jun. 7-9, 1968 concert at the Detroit, MI. Grande Ballroom that featured Cream, MC5, Carousel, Nickel Plate Express, St. Louis Union, The James Gang and Thyme. First printing. Concert is for the last time Cream played the Grande Ballroom. Art by Gary Grimshaw incorporates a Cream promotional photo surrounded by psychedelic paisleys and documents the Power-Trio at a legendary show shortly before they disbanded. Original owner, an acquaintance of the artist, had them personally sign this in black ink along right-hand margin. Lt. corner tip wear. Exc.