Christmas

Christmas was a traditional holiday celebrated by many Humans on Earth.

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)

The Tenth Doctor claims to have been there at the very first christmas, and while many people believe he was there when Jesus Christ was born, The Doctor is an atheist, and there has been many incidents in Doctor Who that reveal that in the Doctor Who universe there is no such thing as an afterlife, there for no such person as Jesus Christ.

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

K-9 & Company

 * A Girl's Best Friend

Comics

 * A Christmas Story

Novels

 * Nightshade
 * Christmas on a Rational Planet
 * Damaged Goods

Short Story anthologies

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

Other short fiction

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

Audio

 * The Chimes of Midnight
 * The One Doctor (In an extra scene, the Doctor and Mel watch the Queen's speech)
 * Flip-Flop