International Dalek Remembrance Day - day for Doctor Who fans to celebrate the first appearance of the Doctor's greatest enemies, the Daleks, on December 21, 1963.
Blue Christmas is a day of reflection and comfort for those experiencing grief or loneliness during the holidays, observed on the longest night of the year.
National Crossword Puzzle Day is a celebration of the world's most popular word game, marking the anniversary of the first published crossword in 1913.