The Retina Circus was a light show founded in 1966 in San Francisco by Bob Carr and Conrad Keeler. Shortly after the founding, the Retina Circus moved to Seattle and was the resident light show at Eagles Auditorium until 1970.
Promotional poster for the Retina Circus Light Show.
Poster is dated 3/1/1966, but AOR has the poster listed as 1967.