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Second this, Reader Rock Gardens is beautiful!! Just make sure you look at what events are happening at the Stampede Grounds nearby - when we went was the weekend of a motocross event that had apparently ruined someone's ceremony with the noise
You can look at Lougheed House, they have an outdoor ceremony space that is beautiful. There is also Reader Rock Gardens, that is stunning. Heritage Park has a couple of ceremony sites to pick from. These are just a few in the city, if you go to google and search ceremony sites in and around Calgary you can find more. Hope this is a good start, good luck with your search!