text: In 1989, one of these events in Montreal occurred after the perpetrator was said to have separated the males and the females beforehand.
full_question: In 1989, one of these events in Montreal occurred after the perpetrator was said to have separated the males and the females beforehand. Another one of these events occurred in Roseburg, Oregon, and was planned by Christopher Harper-Mercer. Alex Jones called one these events a "giant hoax", leading to a defamation lawsuit by the parents of the victims. These events are the topic of a documentary by Michael Moore, and a notable one occurred in Florida in 2018. For 10 points, name these events, examples of which include Parkland and Columbine.
first_sentence: In 1989, one of these events in Montreal occurred after the perpetrator was said to have separated the males and the females beforehand.