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One thing that our family has done for many years is to have a special activity to do each day for the month of December. I bought this cute hanging calendar with pockets a long time ago, like this one, and I like to put a little paper in each pocket with the activity for the day.
Just click on the picture below to print. Then just cut out and put the papers in your own hanging calendar. I didn't put any dates on the activities so you so choose which activities fit best with your schedule.