Flight
You will fly into Montreal-Pierre Elliott Trudeau Airport, YUL.
Hotel
Here is the link to reserve a room: https://www.marriott.com/events/start.mi?id=1638483431271&key=GRP
House Or Rental
If you want to rent an apartment we've used this service and their properties are very nice. Be prepared for lots of stairs and only 1 bathroom in most.
Travel Note
When coming from the Airport use a licensed cab instead of Uber. There is a fixed rate with the cab companies. Also, DO NOT RENT A CAR! You don't need one and parking is no fun in Montreal.
Train
Load the "Transit" app to your phone to help map where you want to go using local transit. You can purchase a 3 day metro pass for $20.50 CAD