i) births and deaths

None that caught my eye.

ii) broadcast anniversaries

26 October 1987: broadcast of fourth episode of Paradise Towers, In a final confrontation, both Pex and Kroagnon are killed, and the inhabitants of the Towers look forward to a new future.

26 October 1988: broadcast of fourth episode of Remembrance of the Daleks. Grand battle between the Dalek factions; the Doctor destroys Skaro and also forces the Black Dalek to explode.

26 October 2010: broadcast of second episode of Death of the Doctor (SJA). The Doctor is not dead after all! Hooray!

iii) historical event in canon

26 October 1881: The gunfight at the O.K. Corral, as witnessed by the First Doctor, Steven and Dodo in The Gunfighters (1966).