1 December 1932: birth of Dennis Spooner, script editor / story editor of Doctor Who for first months of 1965 (from The Rescue to The Chase), also writer of The Reign of Terror (First Doctor, 1964), The Romans (First Doctor, 1965), The Time Meddler (First Doctor, 1965), much of The Daleks' Master Plan (First Doctor, 1965-66) and the first episode of The Power of the Daleks (Second Doctor, 1966).
1 December 1955: birth of Kelly A. Manners, sole full producer on Torchwood: Miracle Day.
1 December 2008: death of James Bree, who played the Security Chief in The War Games (Second Doctor, 1969), Nefred the Decider in Full Circle (Fourth Doctor, 1980) and the Keeper of the Matrix in The Ultimate Foe (Sixth Doctor, 1986).
ii) broadcast anniversaries
1 December 1979: broadcast of second episode of Nightmare of Eden. More drugs, monsters, and strangely fused spaceships.
1 December 2008: broadcast of first episode of Enemy of the Bane (SJA). Mrs Wormwood returns, allied with both the Bane and the Sontarans; Sarah teams up with the Brigadier to break into UNIT.
iii) date specified in-universe:
1 December 1955: in Montgomery, Alabama, civil rights activist Rosa Parks refused to give up her seat, on a segregated bus, to a white passenger, when the bus became crowded enough that she was required to move.