Whiner's Day is held on December 26. This event in the third decade of the month december is annual.
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);
Card Playing Day on December 28 (Playing cards are thought to have first been introduced to the world in China);
Tick Tock Day on December 29 (urges us to make the most of this time to complete those tasks that can be done in that time)