|Date:||March 16, 1974|
A review of the show reveals that Queen refused to come on for a fourth encore, leading to a riot during which two people were stabbed and a couple crew members were hurt. The band were locked up in the kitchen backstage during the mayhem.
Perhaps it was after this show that the lighting crew quit. It would certainly make sense, as the following night's show would be canceled (and rescheduled to April 2).
The scan of the poster was submitted by David van Dijk.