5 December 2001: death of Michael Leeston-Smith, director of the story we now call The Myth Makers (First Doctor, 1965).
5 December 2013: death of Barry Jackson who played Ascaris in the story we now call The Romans (First Doctor, 1964), Jeff Garvey in Mission to the Unknown (First Doctor era, 1965) and Drax in The Armageddon Factor (Fourth Doctor, 1979).
ii) broadcast anniversaries
5 December 1964: broadcast of "Day of Reckoning", third episode of the story we now call The Dalek Invasion of Earth. This is the fantastic episode with Jenny, Barbara and Dortmun fleeing across London to Francis Chagrin's amazing music, followed by Dortmun's last stand against the Daleks. This is such a brilliant sequence.
5 December 2015: broadcast of Hell Bent, ending Series 8 of New Who. Returning to Gallifrey, the Doctor must face his own people, the Time Lords, but how far will he go in his quest for vengeance? Does he have another confession? And how fiercely does his rage towards them for causing Clara's death burn?
iii) date specified in canon
5 December 1920: Kathy Nightingale is transported to Hull from 2007 by the Weeping Angels. (As seen in Blink, Tenth Doctor, 2007.)