If I were a customer receiving these, I'd be a little reluctant to stick them on to anything in my house. So instead of adhesive on the back, let's pay a few pennies more and get the flexible magnet stuff. Then I could easily stick the calendar on my refrigerator.
From our point of view, the store handing out the calendars, the cover sheet is a bit annoying. Especially since we didn't get our order until January - after the holidays. Next year, advertise that people should order early, because lead times for these calendars is extra long in December.