Your stories about Montreal made me remember the mayhem in Buenos Aires following the last FIFA world cup's final in 2014 (pic below).
I always think about the politial implications of the world cup and soccer in general. During the course of the Russia world cup the national currency (ARS) devaluated more than 20% but nobody cared because they were all watching soccer. One could think that advancing in the cup stages would be good for the people's happiness but being close to win may unleash more violence than getting out earlier.
This year the national team got out early from the cup and no riots were involved.