It was held at the Chalk Farm Road Roundhouse Theatre and featured on the bill not only a public playing of "Carnival of Light" but performances by Unit Delta Plus, whose members included early electronic music pioneers Delia Derbyshire, Brian Hodgson from the BBC Radiophonic Workshop and fellow electronic artist Peter Zinovieff.
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According to Beatles author and Zappa biographer Barry Miles, the unreleased Beatles experimental track "Carnival of Light" which was recorded in January 1967 resembles "The Return of The Son of Monster Magnet," although it is believed that "Carnival of Light" is more fragmented and abstract than Zappa's effort the previous year.