i) births and deaths

29 December 1928: birth of Bernard Cribbins, who played Tom Campbell in Daleks – Invasion Earth 2150 AD (1966) and Wilfred Mott in various Tenth Doctor episodes from Voyage of the Damned (2007) to The End of Time II (2010); also Arnold Korns in the 2007 Eighth Doctor audio Horror of Glam Rock

29 December 1963: birth of Julian Bleach, who has played Davros in New Who, the eponymous Nightmare Man in Sarah Jane, and the Ghostmaker in the Torchwood episode From Out of the Rain.

ii) broadcast anniversaries

29 December 1973: broadcast of third episode of The Time Warrior. Irongron's attack on Edward of Wessex's castle fails; the Doctor and Sarah infiltrate Irongron's castle, but are caught by Linx.

29 December 1979: broadcast of second episode of The Horns of Nimon. The Doctor and Romana end up in the maze with the teenage sacrifices.

iii) Date specified in-universe

29 December 1758: Setting of the climactic scenes of The Girl in the Fireplace (2006).