I have an interest in events in Montreal so I took a glance and came across this:

https://blog.mtl.org/en/AIDS-2022

39,000 room nights projected...pretty big event!

At the same time is Just For Laughs, the largest comedy festival in the world and draws 2M attendees (granted, many from within the metro)

Between these two events I'd say the hotel will be fully booked pretty soon, probably as the Just For Laughs performance schedule gets announced.

https://www.hahaha.com/en/calendar