My ticket stub was never torn (note perforated top right corner) due to the confusion over my taping gear.
guard: Verboten!
me: no, no... permitted.
guard: Verboten!
this went on for a while, until Brad Sands came over and straightened things out.
The venue was a roofless interior courtyard in a building which had been Adolf Hitler's Nazi SS headquarters. The walls were covered with vines which gave it the appearance, as Trey commented, of playing inside of a giant plant.