Actually, this is the poster for the gig that Otis never made. His plane crashed into Lake Monona in Madison. Yeah, the Grim Reapers were Cheap Trick. This show was promoted by Ken Adamany, who would later manage Cheap Trick during their heyday.
The name of the artist is William Barr. My Dad was at that concert - I always wondered if there were any surviving posters, he said he grabbed one that night after Cheap Trick played and the news came out about the crash but of course he lost it. That's about a $7000 poster.