Original 1st printing 22&5/8 x 28&1/2" proof sheet (untrimmed top/bottom/right borders) tour blank concert poster for a proposed Warner Brothers-sponsored series of (canceled) free concerts to be held over the summer of 1970, featuring the Grateful Dead, along with Crazy Horse (without Neil Young) and Sal Valentino.
Art by Greg Irons, medium-thick glossy-coated index stock poster is in spectacular near mint (A-/B+) condition; just a stray handling ding/corner bend or two, a tiny 1/4" tear in the left center margin, a 2" soft bend in the lower right corner and a few stray surface scratches, otherwise fine.
Since the tour was canceled (it actually sort-of morphed into the 1970 "Medicine Ball Caravan" tour, with different participants), most of the posters were remaindered and never made it out of the print shop (Tea Lautrec). This particular example has a light/subtle overprint of the yellow pass of ink from the BG 247 poster, printed later that summer. A VERY uncommon and AWESOME-looking Grateful Dead poster.