Since it hasn't been mentioned yet, the Airdrie Air Show is coming up next weekend (July 13-14). The snowbirds will be there in the air as well as many civilian aircraft. There will also be a CF-18 and a Hercules on the ground, as well as more civilian aircraft.
I doubt it will be as impressive as some of the bigger events like Lethbridge, but since it's so close to town, it will probably still be a good time!
Just realized I should have posted a link to the website
http://www.airdrieairshow.com/