Where are you staying? Downtown you have 2 casinos Elbow is the biggest and will always have a 4/8 kill going on. Stampede will have 3/6 kill and 1/2 NL regularly.
If you're staying near the airport Casino Calgary is your best bet they have 4/8 kill and the 1/2 is pretty regular. They also have a wednesday tourney, not sure how much it is though.
For tournaments Cash Casino is your best check out
www.cashpoker.ca for their tourney schedule. They also spread 1/2 on a regular basis and of course the Calgary staple 4/8 kill.