Humbug Day
Humbug Day is held on December 21. This day was created to allow us an opportunity to express our frustrations. This event in the third decade of the month December is annual. 
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It is a holiday that allows you to cast off your frustrations before Christmas. Because the pressures of the festive season can get to us all, it is important that we all get a day to vent out all our frustrations.
Bah humbug is an exclamation that conveys curmudgeonly displeasure. The word is well-known as the catchphrase of miserly old Ebenezer Scrooge, the main character in Dickens' 1843 novel, “A Christmas Carol.” Scrooge, who thinks Christmas is an enormous deception, retorts, “Bah! Humbug!” to anyone who dares to wish him a merry Christmas.
Similar holidays and events, festivals and interesting facts
Go Caroling Day on December 20
Flashlight Day on December 21
Look on the Bright Side Day on December 21
Roots Day on December 23
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);
Whiner's Day on December 26
Thank You Note Day on December 26