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On 9月21日, the following important behind-the-scenes events were known to have occurred:
- 1970 - Location filming for Terror of the Autons took place. (REF: Doctor Who The Handbook: The Third Doctor)
- 1983 - Studio filming Resurrection of the Daleks took place at BBC Television Centre studio 1. (REF: Doctor Who The Handbook: The Fifth Doctor)
- 1993 - Studio filming for Dimensions in Time took place at Fountain TV studios, New Malden, Surrey. (Doctor Who The Handbook: The Seventh Doctor)
- 2002 - The Big Finish audio story Jubilee was recorded at the Moat Studios.
- 2005 - The Big Finish audio story Pier Pressure was recorded at the Moat Studios.
- 2008 - The Big Finish audio story Death in Blackpool was recorded at the Moat Studios.
- 2016 - The Big Finish audio story The Wreck of the World was recorded at the Moat Studios.
- 2016 - The Big Finish The Tribulations of Thadeus Nook was recorded at Audio Sorcery.
- 2017 - Big Finish confirmed a third series of The Diary of River Song.
- 2020 - Big Finish's audio releases Colony of Fear and The Third Doctor Adventures: Volume Seven were recorded.
- 2020 - Paul Magrs began writing A Tingle of Happiness.
- 2021 - The Big Finish audio story The Annihilators was recorded.
- 2021 - The Big Finish audio anthology Battlegrounds was recorded at the Soundhouse.