Buffet for large group

Wondering if you guys can help me with a venue choice.

I'm looking for a location where they serve a buffet brunch for a large group (60ish people). I'm pretty set on it being brunch so that folks can get on with their day and still enjoy their afternoon and evening.
We will be having my daughters baptism sometime in September and I'm tired of the traditional (my husbands culture) Chinese buffet for lunch or dinner. I would like to something where the families that celebrate with us get to have a day out as well.
So far I have thought of: Calgary Zoo, Fort Calgary, Heritage Park, Butterfield Acres.

Where else in the city is there? If the above are the only options, any suggestions on a place where there is a decent buffet for brunch that will host that many people?

.

I've had a good experience at the Fairmont. Not with 50 people mind you.

Yellow door bistro downtown has a brunch buffet, not sure about capacity limit though for a large group. Could check them out.

Carriage House Inn might be able to handle a group that size.

Fort Calgary's buffet is amazing.

Butterfield Acres is not a choice. They don't even have running water.

Grey eagle casino

Thanks for the feedback on Fort Calgary suntan.

After chatting with some of the people, I think i'm leaning towards the Zoo. It gives our family a more enjoyable day.
It will be the most expensive option so I will have to scale down the guest list a little.