At a get-together at the Oven and Tap, a restaurant in Bentonville, Arkansas, in October 2015, people were talking about National Days. The conversation then turned to what day on the calendar had little or no National Days attached to it. When it was announced that January 1 was only known as New Year’s Day, Keegan Calligar and Marlo Anderson both stated simultaneously that it should be National Hangover Day.
Keegan Calligar and Marlo Anderson submitted National Hangover Day in October 2015. The day was approved by the registrar of National Day Calendar® in November of 2015.