[edit] Salon de Montréal

Large reception room on top of Montreal Tower.

Distance: about 1km from venue, walkable.
Cost: TBD
Capacity: TBD
Technical sheet: http://parcolympique.qc.ca/wp-content/uploads/2013/04/fiche-technique-salles-tour.pdf
Highlight(s): Funicular ride, awesome view of Montreal & surroundings
Cons: Not friendly for participants who have fear of heights

[edit] Jardin botanique

Outdoor reception in one of the gardens, or inside the greenhouses.

Rentals are suspended as of April 8th, 2016. Need to inquire about availability in 2017.

Distance: about 1.5km, walkable
Cost: TBD
Capacity: TBD
Technical sheet: http://www1.ville.montreal.qc.ca/banque311/content/jardin-botanique-location-de-salles-et-de-sites
Highlight(s): Beautiful, natural setting. Exotic/rare plants in the greenhouses.
Con(s): Outdoor option may be risky because of rain.