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On 8月20日, the following important behind-the-scenes events were known to have occurred:
- 1963 - Filming for Doctor Who began. In the initial session, the title sequence was created by Bernard Lodge. He pointed a camera at the camera's monitor screen, which created the pattern of feedback, or what is known as "the howl-around effect". Lodge later recalled that his work on this day was inspired by the work of Ben Palmer, who had done something similar on Amahl and the Night Visitors.
- 1977 - Studio filming for Image of the Fendahl took place at BBC Television Centre studio 6. (REF: Doctor Who The Handbook: The Fourth Doctor)
- 1978 - Location filming for The Power of Kroll took place. (REF: Doctor Who The Handbook: The Fourth Doctor)
- 2007 - The Big Finish audio story Sisters of the Flame was recorded at the Moat Studios.
- 2009 - Big Finish's audio story Deimos / The Resurrection of Mars was recorded at the Moat Studios.
- 2014 - Big Finish's audio adaptation of the novel The Well-Mannered War was recorded at Audio Sorcery.
- 2015 - Big Finish's Torchwood audio story Uncanny Valley was recorded at Ladbroke Audio.
- 2018 - Big Finish's audio drama anthology The Eighth Doctor: The Further Adventures of Lucie Miller: Volume One was recorded at the Moat Studios.
- 2018 - Big Finish announced a special audio box set, The Legacy of Time, to commemorate the twentieth anniversary of Big Finish's Doctor Who audio adventures.
- 2019 - Big Finish's audio anthology Blood on Santa's Claw and Other Stories was recorded at the Soundhouse.
- 2019 - Big Finish announced the audio box set The Sixth Doctor and Peri: Volume One.