This 35mm presentation, which is also being screened on May 28th, is is part of the The Spirit of '68 season at BFI Southbank. You can find all the details here.
Chicago Reader review:
We may forget that the most radical rethinking of Marx and Freud found in European cinema of the late 60s and early 70s came from the east rather than the west. Indeed, it's hard to think of a headier mix of fiction and nonfiction, or sex and politics, than this brilliant 1971 Yugoslav feature by Dusan Makavejev, which juxtaposes a bold Serbian narrative shot in 35-millimeter with funky New York street theater and documentary shot in 16. The "WR" is controversial sexual theorist Wilhelm Reich and the "mysteries" involve Joseph Stalin as an erotic figure in propaganda movies, Tuli Kupferberg of the Fugs "killing for peace" as he runs around New York City with a phony gun, and drag queen Jackie Curtis and plaster caster Nancy Godfrey pursuing their own versions of sexual freedom.'
Here (and above) is an extract.