21 November (production)

* 1963 - The first ever Doctor Who press conference was held to launch the new show. All four lead actors and David Whitaker attended the event at BBC .
* 1963 - Radio Times published an article announcing the debut of Doctor Who. This was the first Doctor Who-related article ever published.
* 1966 - Location filming for The Highlanders concluded at Frensham Ponds. (TCH 9)
* 1978 - Studio filming for The Armageddon Factor took place at BBC Television Centre studio 3. (REF: Doctor Who The Handbook: The Fourth Doctor)
* 1980 - Studio filming for The Keeper of Traken took place at BBC Television Centre studio 8. (REF: Doctor Who The Handbook: The Fourth Doctor)
* 1999 - The Big Finish audio story Red Dawn was recorded at the Nu Groove Studios.
* 2001 - The Big Finish audio story Excelis Dawns was recorded at the Moat Studios.
* 2005 - The Big Finish audio story The Kingmaker was recorded at the Moat Studios.
* 2017 - Big Finish announced the casting of Patsy Kensit for Kingdom of Lies.
* 2020 - Doctor Who: Lockdown! hosted a tweetalong of The Pilot.