Yep, I got that location as well. My application is a Scarborough one.
Is it the July 19th ceremony?
Seems to be a special one hosted by the Institute for Canadian Citizenship with roundtable discussions, the ceremony itself, time for photos and a reception with cake and refreshments. Looking online it seems these are pretty rare occurrences and it's exciting to get invited to one as it becomes a bit more of an occasion than the normal ones. I think it should be a nice end to the whole process!
There was a separate letter inside ours from the Institute for Canadian Citizenship with various details.