Glad to hear you are making a trip out to Calgary. Hopefully the weather will be a little better than it is right now.
Just wanted to give you a quick heads up... 7-11's in Canada are not like the 7-11's in the states (no booze at the 7-11's in Canada
). Although you should be able to get most of your supplies I would suggest hitting up a Superstore or Wal-Mart as they are open until 11 pm.