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On 20 October, the following important behind-the-scenes events were known to have occurred:
- 1964 - The Hidden Planet was officially rejected by script editor David Whitaker.
- 1969 - Location filming for Spearhead from Space took place. (REF: Doctor Who The Handbook: The Third Doctor)
- 1975 - Studio filming for The Brain of Morbius took place at BBC Television Centre studio 3. (REF: Doctor Who The Handbook: The Fourth Doctor)
- 1977 - Full scripts for The Pirate Planet were commissioned from Douglas Adams.
- 1978 - Filming for The Power of Kroll took place at Bray Studios. (REF: Doctor Who The Handbook: The Fourth Doctor)
- 1981 - Studio filming for Black Orchid took place. (REF: Doctor Who The Handbook: The Fifth Doctor)
- 2009 - The Big Finish audio story Legend of the Cybermen was recorded at the Moat Studios.
- 2011 - The first series of Big Finish's audio series Counter-Measures was recorded at the Moat Studios. The series was announced on the Big Finish website.
- 2017 - The Big Finish audio story I Am The Master was recorded at the Moat Studios.
- 2018 - Big Finish's The War Master audio anthology Rage of the Time Lords was recorded.
- 2020 - The Big Finish audio story The End of the Beginning was recorded remotely.
- 2022 - Big Finish announced the casting of Shane Richie and Nina Wadia for the audio anthology Connections.