11 December was a date.
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Holidays and observances
11 December was the date of the Feast of Rassilon on Gallifrey, a winter celebration. (PROSE: Time Traveller's Diary)
Events
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)
Other
According to a fake passport used by Gwen Cooper, "Yvonne Pallister" was born in Kensington on 11 December 1974. (TV: The Categories of Life)
According to a calendar on the Snowcap base, 11 December 1986 was a Thursday. (TV: The Tenth Planet)