You mean other Toronto events or other Ontario wargaming events?
Because both are sort of thin, to be honest. Toronto's major cons are Fan Expo (the big one, mostly comic, movie, and TV show related) and the mostly-anime Toronto Comic Con (who's name escapes me at the moment) that's sort of morphed into a second, lesser Fan Expo.
They used to be closer together, around May-July, but Comiccon has moved to early March and Fan Expo is Late August now.
Neither feature wargaming in any meaningful quantity, if at all, though some years GW has had a fair presence at Fan Expo (not sure if they still do?). Though I haven't been to either con in well over five years, so maybe that's changed?
The only real dedicated wargaming con in Toronto at all is when Astronomicon comes to town (in April). And, well, that's GW's show.
Elsewhere in Ontario, I think the only other major con is Cangames in Ottawa. Online information seems to indicate it has wargaming, but I've never been so I don't know how much. That's in May this year. And of course you folks mentioned KEGSCON in September. I don't know what was meant by Council Fire though - is that another con or just a get-together.
Seems like June or October would be good bets to keep your distance from other shows, as long as they keep to the same rough dates. July too, but make sure the place is well air-conditioned in that case.