From their website:

The Restaurant
Hart House Restaurant's main dining room is available for exclusive buyout bookings and can accommodate up to 80 guests seated, and 100 reception-style. In the summer months this includes access to one of the Lower Mainland's most gorgeous patios.
The restaurant features four fireplaces, a bar and a sound system for background music and speeches.

The Tent
The Tent can accommodate 200 guests comfortably. It has a full floor, dance floor, and a draped ceiling with chandeliers, and includes sidewalls and heaters. Our Tent season starts in mid-May and ends with the first weekend in October.  Wedding ceremonies take place on the lawn and are moved into the reception space in inclement weather. Rental of the tent includes use of the Lakeside Cottage.