11 December

11 December was the date of the Feast of Rassilon on Gallifrey, a winter celebration. (PROSE: Time Traveller's Diary)

In 1983, the Seventh Doctor, Benny, Jason, Roz, and Chris continued their visit to Little Caldwell, during which they were opposed by the Albinex. (PROSE: Return of the Living Dad)

According to a calendar on the Snowcap base, 11 December 1986 was a Thursday. (TV: The Tenth Planet)

According to a fake passport used by Gwen Cooper, "Yvonne Pallister" was born in Kensington on 11 December 1974. (TV: The Categories of Life)