The flag in the middle is likely Manitoba or possibly Ontario. Looked at news pics and Winnipeg had a yellow vest protest and the crowd size looked similar.
I stand corrected and also see it is Calgary City Hall. Darn winnipeg news channel didn't label pic.
Great find article confirms location https://www.cbc.ca/news/canada/calgary/alberta-yellow-vest-protests-1.4938333
(I was fooled by the flag looks like Manitoba in the pic, kek)