Advent Ember Days of Fasting Dec. 17, 19, and 20

The traditional Ember Days of fasting for Advent are Wed., Fri., and Sat., Dec. 17, 19, and 20. While a fast is not obligatory, it is a worthy traditional spiritual practice to fast or abstain in some way on one or more of these days. 

More info here at https://www.fisheaters.com/emberdays.html