Roots Day is held on December 23. This event in the third decade of the month december is annual.
Humbug Day on December 21 (This day was created to allow us an opportunity to express our frustrations);
HumanLight Day on December 23 (is a secular holiday that focuses on the "positive, secular human values of reason, compassion, humanity and hope");
Festivus on December 23 (a holiday made popular by the sitcom Seinfeld, as an alternative to the pressures and commercialism of the Christmas season);