National Biscuits and Gravy Day

Takes place twice annually, on the 14th of the month of December and on the 21st of the month of February.

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References:
brighthaven.wordpress.com/2011/12/14/national-biscuits-and-gravy-day/
mobile-cuisine.com/food-holidays/december/
nationaleats365.com/2016/02/21/national-biscuits-gravy-day/