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.