Every day of the year, at least in the US, is National Something or Another Day. Mostly made up by some trade group or the like.
Today just happens to be National Drink Wine Day. Made my wife smile when we heard it on the radio. She plans on recognizing the holiday after work tonight.
Tomorrow is National Chocolate mint Day and National Vet Girls RISE Day celebrating female veterans. Thursday is Cherry Pie day. Mmmmm, cherry pie.
For a calendar of all National Days: