In Alberta:
Animethon - Edmonton, AB, August 6 - 8th
Held at the Grant MacEwan City Centre Campus, Animethon lists itself as being "Canada's longest-running festival celebrating Japanese animation."
I've been for four years, this upcoming year will be the fifth year I go myself and I always find it to be pretty fun and there's usually a good variety in panels and guests.
In B.C:
Anime Evolution - Vancouver, BC, Aug 13 - 15th
This year Anime Evolution is being held at UBC. They have a long list of guests coming which if you want to check more up on you can find here.
Also I have to say they seem really well organized. Even with no schedule up yet (though there's bound to be soon), on the forums you can already check out what fan panels are running along with descriptions here.
In Ontario:
FanExpo Canada - Toronto, ON, Aug 27 - 29
Held at the Metro Toronto Convention Centre this convention focuses on five things: comic, anime, sci-fi, horror, and gaming.
In Quebec:
Otakuthon - Montreal, QB, August 13 - 15th
What is Otakuthon? Their FAQ answers this best:
"Otakuthon is Quebec’s largest fan-run festival promoting Japanese animation (anime), Japanese graphic novels (manga), related gaming and Japanese pop-culture. We are a not-for-profit organization that is a part of the Quebec Anime Committee."

