24 August 1932: birth of William Morgan Sheppard, who played the older Canton Everett Delaware III in The Impossible Astronaut / Day of the Moon (Eleventh Doctor, 2011)
24 August 1957: birth of Stephen Fry, who played C in Spyfall (Thirteenth Doctor, 2020) and also wrote an untelevised script for the Tenth Doctor.
ii) broadcast anniversary
24 August 1968: Broadcast of episode 3 of The Dominators (1968). Zoe, Cully and the other Dulcians are being used by the Dominators as slave labour. Cully escapes, but the Doctor is captured, and yet another episode ends with falling masonry. Those costumes though!
iii) date specified in canon
24 August 79: Vesuvius erupts, seen most notably in The Fires of Pompeii (Tenth Doctor, 2008).