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On 21 September, the following important behind-the-scenes events were known to have occurred:
- 1993 - Studio filming for Dimensions in Time took place at Fountain TV studios, New Malden, Surrey. (Doctor Who The Handbook: The Seventh Doctor)
- 2002 - Recording for Jubilee took place at The Moat Studios.
- 2005 - Recording for Pier Pressure took place at The Moat Studios.
- 2008 - Recording for Death in Blackpool took place at The Moat Studios.
- 2016 - Recording for The Wreck of the World took place at the Moat Studios.
- 2016 - Recording for The Tribulations of Thadeus Nook took place at Audio Sorcery.
- 2017 - Big Finish confirmed a third series of The Diary of River Song.
- 2020 - Recording for Colony of Fear took place.
- 2020 - Recording for The Third Doctor Adventures: Volume Seven took place.
- 2020 - Paul Magrs began writing A Tingle of Happiness.
- 2021 - The Big Finish audio story The Annihilators was recorded.