24 November 1999: death of Hilary Minster, who had two rather minor roles as Thals - Marat in Planet of the Daleks (Third Doctor, 1973) and an unnamed soldier in Genesis of the Daleks (Fourth Doctor, 1975), but is of interest to me as the only person to have been semi-regular character in both Secret Army, where he played Hauptmann Muller, and Allo! Allo!, where he played General von Klinkerhoffen - a high ranking Wehrmacht officer in both cases.
ii) broadcast and webcast anniversaries
24 November 1979: broadcast of first episode of Nightmare of Eden. Two spaceships collide coming out of hyperspace; the Doctor, Romana and K9 start to uncover murky doings with the addictive drug vraxoin.
24 November 2008: broadcast of second episode of The Temptation of Sarah Jane Smith. Sarah's parents sacrifice themselves to prevent the Graske's plan.
24 November 2009: release of fourth episode of Dreamland.
iii) date specified in-universe
24 November 2119: setting of most of Under the Lake / Before the Flood (Twelfth Doctor, 2015) - we are told that the very first section is on 21 November 2119 and then the TARDIS arrives three days later.