Primo Showbar concert posters were designed by Gary Grimshaw.

Gary Grimshaw (February 25, 1946 – January 13, 2014) was a graphic artist who did the cover art for albums by the MC5 and the poster for the John Sinclair Freedom Rally. He was Minister of Art and Central Committee member of the White Panther Party.

More information

• Gary Grimshaw: Corridor Artist, Illustrator, Tribes of the Cass Corridor
• http://www.garygrimshaw.com/
• http://freeingjohnsinclair.aadl.org/freeingjohnsinclair/leni_sinclair_0008
• Wikipedia: Gary Grimshaw