Given the task definition and input, reply with output. In this task, a passage will be given and the goal is to generate a question about temporal relations based on that passage. A temporal relation describes the relation between two things with respect to time e.g., something happens/starts/terminates/... immediately/shortly/usually/... before/after/during/... something else.
Your question should include an event, or ask about an event, and should not be a yes/no question.

Passage: Mobilizing in large numbers around the square where the concert was held, police and emergency-response teams quashed the outbreaks of violence. An hour before the five-man group was scheduled to appear, police decided the situation was under control and allowed the show to go on.
What event has already finished?