Christmas

Christmas (literally, the Mass of Christ) is a traditional holiday. Traditionally, Christmas Eve was observed on 24th December and Christmas Day was observed on 25th December.

Although he is an alien, the Doctor has developed a fondness and appreciation for the celebration of Christmas, and his companions Sara Kingdom and Steven Taylor both seemed familiar with it, indicating that Christmas observances still existed until Sara Kindgom's home period of the 41st century. (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)

Doctor Who

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

Torchwood

 * Out of Time

Comics

 * A Christmas Story

Novels

 * Christmas on a Rational Planet

Short Story anthologies

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

Other short fiction

 * Prelude: Condundrum
 * Deep and Dreamless Sleep