"[T]he 21,189 spectators, who sat in warm and muggy conditions with the Rogers Centre roof closed due to excessive heat. They also had to endure watching the opening half in a smoky haze thanks to pre-game fireworks."

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http://www.cbc.ca/m/rich/sports/story/2011/07/23/sp-argos-bombers-cfl.html

I was there yesterday in the hotel for the game. One of the other people in the room spent most of the 1st quarter shouting for them to open the roof. Clearly, he wasn’t the only one thinking it.