On 25th January, 2012, the DQ in my city is offering 1/2 price cake and novelties and I found the same deal in Burlington, ON on 28th January, 2012.
From the link above, just enter in your postal code to find the Dairy Queen location and stores holding Customer Appreciation events in January.
I love Dairy Queen ice cream cakes with that layer of fudge and chocolate crunch in the ice cream. So good! I also like the snack size Blizzards, still big enough to share though, the ice cream treat is very filling.
Expires: various dates in January, 2012