"Islamophobic" events routinely experience the sudden cancellation of venue (e.g. the upcoming visit of Tommy Robinson and Kevin Carroll to Denmark and Sweden) due to security problems, but it's unusual for an Islamic event to suffer the same fate.
Djemila Benhabib is presently being sued for comments she made on a radio programme regarding that school. The Muslim Brothers have deep pockets to pay for lawyers and intimidate people.
The conference in Montreal was cancelled because of "risk of trouble to public order". People in Quebec are waking up to Islam and various groups were planning to protest, including Femen Quebec. Thousands of protesters were expected. The police were planning to send 150 officers, plus the cavalry, plus a helicopter, in addition to officers securing the basement of the Convention Centre and the two metro stations leading to it. Lots of taxpayers' money because of these nuts.
The video is a scathing report detailing the associations - including the Muslim Brotherhood, Al Qaeda, and the Muslim World League - of the organizers of the planned conference at the Palais des congrès.
Many thanks to "Watsilavit" for making this video, Christian Brunet Levitan for the French transcript, CB Sashenka for the translation, and Vlad Tepes for the subtitling: