A lot of groups use the number of the month to focus on the corresponding number of a Step or Tradition. December is the 12th month of the year so here is Step 12 and Tradition 12, and some associated readings.
12th Step
“Having had a spiritual awakening as the result of these steps, we tried to carry this message to alcoholics, and to practice these principles in all our affairs.”
12th Tradition
“Anonymity is the spiritual foundation of all our Traditions, ever reminding us to place principles before personalities.”