Christmas

Christmas (literally, the Mass of Christ) is a traditional holiday celebrated by Humans on Earth. Traditionally, Christmas Eve was observed on 24th December and Christmas Day was observed on 25th December. In some countries (particularly Canada and Great Britain), 26th December is additionally celebrated as Boxing Day and is treated as a full holiday in some areas.

History
Although he is an alien, the Doctor has developed a fondness and appreciation for the celebration of Christmas. Christmas celebrations existed in as far away a time and place at the planet Puxatornee in the year 3090. (BFA: Flip-Flop) Even the normally serious Sara Kingdom from year 4000 felt ready to celebrate the holiday with him. (DW: The Daleks' Master Plan)

The Doctor, jokingly or otherwise, claimed to have left Rose Tyler a red bicycle she wanted for Christmas many years before (from her perspective) they first met. (DW: The Doctor Dances)

Christmas activities in England include pantomime. At a UNIT Christmas party, the Doctor, Jo Grant and others put on a production of Aladdin. (NA: Timewyrm: Revelation, No Future)

Earth -- and, specifically the vicinity of London -- experienced a number of major events involving aliens at or around Christmas Day. In 2005, Christmas coincided with the arrival of the Guinevere One space probe at Mars, but this celebration was disrupted by the subsequent Sycorax invasion; this event was later cited by the Doctor as the moment the people of Earth were irrevocably introduced to the idea of alien life (after years of isolated and covered-up incidents) (DW: The Christmas Invasion). In 2006, the arrival of the Webstar over London panicked the populace. (DW: The Runaway Bride). For Christmas 2007, the populace of London (except a few holdouts such as Queen Elizabeth II and Wilfred Mott) voluntarily evacuated the city in case of another alien invasion (no invasion occurred, but a spaceship replica of The Titanic nearly crashed into Buckingham Palace). (DW: Voyage of the Damned).

Other Christmastime incidents have included a Christmas Eve attempt by the Gelth to come through the Cardiff Rift in 1869 (DW: The Unquiet Dead). Apparently some incident occurred in San Francisco at Christmas in the year 2000, but the details are not known. (DW: Doctor Who: The TV Movie)

Doctor Who

 * "The Feast of Steven," episode 7 of The Daleks' Master Plan
 * The Unquiet Dead
 * The Christmas Invasion
 * The Runaway Bride
 * Voyage of the Damned

Torchwood

 * Out of Time

Other

 * A Girl's Best Friend

Comics

 * A Christmas Story

Novels

 * Christmas on a Rational Planet
 * Damaged Goods

Short Story anthologies

 * Short Trips: A Christmas Treasury
 * Short Trips: The History of Christmas

Other short fiction

 * Prelude: Conundrum
 * Deep and Dreamless Sleep
 * The Hopes and Fears of All the Years

Audio

 * Flip-Flop