If I'm missing any let me know. Events without known dates are sectioned off within their provinces. However it should be noted that these events are ones that did happen last year and some that may have even started last year may not happen again this year.
For example Animinitime appeared to be a one thing time for 2010 and so it has been removed as they've gone back to Animaritime for 2011. However things like A Taste of Animethon just started last year and it is unknown yet if they'll continue that event yet.
Events with unknown dates have been listed alphabetically by name.
Canadian Convention List 2011
Alberta
A Taste of Animethon - Edmonton, AB - February 12th
Noob Con - Grande Prairie, AB - February 12th (It's held at the Grande Prairie Composite High School from what I've heard. Although there currently seems to be no website for this event. Thanks Pauline for the info!)
Japanese Animation Festival (JAF) - Camrose, AB - March 12 - 13th
Soba Bowl - Edmonton, AB - March 12th
Edmonton Collectible Toy and Comic Show - Edmonton, AB - March 20th
HaruCon - Red Deer, AB - May 7th
Harufest - Edmonton, AB - May 7th
Underground Con - Calgary, AB - May 7th
Pop Culture Fair - Edmonton, AB - May 8th
Otafest - Calgary, AB - May 20 - 22nd
VulCON GalaxyFest - Vulcan, AB - June 10 - 12th
Calgary Comic & Entertainment Expo (CCEE) - Calgary, AB - June 17 - 19th
Animethon - Edmonton, AB - August 5 - 7th
When Worlds Collide - Calgary, AB - August 12 - 14th
Furthest North - Wildhay Group Campsite, AB - September 2 - 5th
Myth-a-Con - Calgary, AB - September 2 - 4th
FallCon - Calgary, AB - October 14 - 16th
Red & White Calgary Toy & Comic Expo - Calgary, AB - October 16th
Otafest Lite - Calgary, AB - November 12th
Pure Speculation - Edmonton, AB - November 18 - 20th
Bellerose - St. Albert, AB - November 19th
Alberta Events - with no currently known date
Cal Con Gaming Convention - Calgary, AB - (previously has been March, website doesn't seem to exist anymore and it sounds like this convention is no longer running. At least for this year anyway.)
Con-Version - Calgary, AB
Yaoi Fest - Calgary, AB
Yaoi Fest Flirt - Calgary, AB
Yaoi Fest Spring Fling - Calgary, AB
GottaCon - Victoria, BC - Feb 4 - 6th
Tsukino Con - Victoria, BC - February 25 - 27th
Vancouver Comic Con - Vancouver, BC - March 20th
Trumpeter Salute - Burnaby, BC - April 1 - 3rd
Vancouver Comic Con - Vancouver, BC - May 15th
Vancouver Comic Con - Vancouver, BC - July 10th
Cos & Effect - Vancouver, BC - August 13 - 14th
Astronomi-con - Vancouver, BC - August 20 - 21st
Vancouver Comic Con - Vancouver, BC - September 11th
Victoria Steam Exposition - Victoria, BC - September 24 - 25th
VCON - Vancouver, BC - September 30 - October 2nd
CherryBomb Toy Show - Victoria, BC - October 16th
Victoria Comic, Movie, and Steampunk Convention - Victoria, BC - November 12 - 13th
British Columbia Events - with no currently known date
Anime Evolution - Vancouver, BC - usually August (looks to be cancelled for this year)
J-Fest - New Westminster, BC
StarCon - Vancouver, BC - was scheduled for June 2011 but has been postponed due to a medical emergency.
Vancouver Comic Con - Vancouver, BC - They hold several events throughout the year. I would suggest checking their site once a month or so for up to date information.
Manitoba
Astronomi-con - Winnipeg, MB - April 30 - May 1st
Keycon - Winnipeg, MB - May 20 - 22nd
Ai-Kon - Winnipeg, MB - July 15 - 17th
Central Canada Comic Con - Winnipeg, MB - October 28 - 30th
Manitoba Events - with no currently known date
Chibi-Con - Winnipeg, MB
New Brunswick
Animaritime - Moncton, NB - July1 - 3rd
New Brunswick Events - with no currently known date
There are no known New Brunswick events that are happening that don't already have dates. If you know of one that is going on that isn't listed at all please leave a comment with the name and website of the event. I will be sure to add it!
NewFoundLand
Sci-fi on the Rock - St.John's, NFLD - April 15 - 17th
NewFoundLand Events - with no currently known date
Newfoundlands West Coast Con - Corner Brook, NFLD
Nova Scotia
Hal-Con - Halifax, NS - November 12 - 13th
Nova Scotia Events - with no currently known date
There are no known Nova Scotia events that are happening that don't already have dates. If you know of one that is going on that isn't listed at all please leave a comment with the name and website of the event. I will be sure to add it!
Ontario
Con-G - Guelph, ON - Feb 19- 20th
Furnal Equinox - Toronto, ON - March 11 - 13th
Toronto AnimeCon - Toronto, ON - March 19 - 20th
Ad Astra - Toronto, ON - April 8 - 10th
Toronto ComiCon - Toronto, ON - April 9 - 10th
Canadian National Steam Exhibition - Toronto, ON - April 29 - May 1st
CanGames - Ottawa, ON - May 21 - 23rd
Anime North - Toronto, ON - May 27 - 29th
Astronomi-con - Toronto, ON - June 11 - 12th
Polaris - Toronto, ON - July 15 - 17th
Condition Furry - London, ON - July 22 - 24th
Con Bravo! - Burlington, ON - July 30 - 31st
TFCon - Mississauga, ON - July 30 - 31st
FanExpo Canada - Toronto, ON - August 25 - 28th
Camp Feral - Algonquin Park, ON - August 31 - September 4th
Action Figure Expo - Toronto, ON - October 30th
Naru2U - Ottawa, ON - November 11 - 13th
DotCon - Toronto, ON - November 12th
Ontario Events - with no currently known date
Kita-Kon - Thunder Bay, ON (looks to be continuing on in 2012)
Northern Anime Festival - Oshawa, ON (on hiatus for 2011)
Suzaku Festival - Ottawa, ON (Cancelled their event in 2010, no new information on what might happen for 2011. Anything I can find says the con is dead and not coming back.)
Prince Edward Island
There are no known Prince Edward Island events happening. If you know of one that is going on that isn't listed please leave a comment with the name and website of the event. I will be sure to add it!
Quebec
G-Anime - Gatineau, QB - Feb 5 - 6th
Festival Geek de Montreal - Montreal, AB - March 5 - 6th
Nadeshicon - Universite Laval, QB - April 9 - 10th
Congres Boreal - Montreal, QB - May 13 - 15th
WTF? (What The Fur?) - Montreal, QB - June 3 - 5th
Otakuthon - Montreal, QB - August 12 - 14th
Montreal Comic Con - Montreal, QB - September 17 - 18th
Cape & Kimono - Quebec City, QB - October 1 - 2nd
Con*Cept - Montreal, QB - October 14 - 16th
Quebec Events - with no currently known date
ICI Pour le Manga - St.Jerome, QB
Saskatchewan
Anime Blitz and Comic Spectacle - Saskatoon, SK - June 4th
Saskatchewan Events - with no currently known date
Nerdfest - Saskatoon, SK - an event that occurred last year, unknown if it will happen this year. Put on by the same group of people who are running Anime Blitz and Comic Spectacle.
Yukon/Nunavut/NorthWest Territories
There are no known Yukon/Nunavut/NorthWest Territories events happening. If you know of one that is going on that isn't listed please leave a comment with the name and website of the event. I will be sure to add it!
There are no known Nova Scotia events that are happening that don't already have dates. If you know of one that is going on that isn't listed at all please leave a comment with the name and website of the event. I will be sure to add it!
