Don't go through meet up, pick the improv class run by the improv company that's popular with people in your demographic (maybe something near the U of T Campus). For instance, in NY, the UCB theater is right near NYU, so tons of nyu students take improv classes there.

edit: just remembered 2nd city has a branch in toronto, they are fantastic. probably a lot of aspiring comedians in the classes (tons of snl people come out of 2nd city)