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On 20 September, the following important behind-the-scenes events were known to have occurred:
- 1963 - The original cast of Doctor Who — that is, William Hartnell, Carole Ann Ford, William Russell and Jacqueline Hill — met for the first time for a photoshoot. The first ever photographs of Doctor Who were thus taken.
- 1968 - Episode one of The Invasion was recorded at Lime Grove Studios D. (TCH 13)
- 2006 - Recording for Return of the Daleks took place at The Moat Studios.
- 2012 - The sixth series of Big Finish's audio series Gallifrey was recorded at the Moat Studios.
- 2015 - Peter Capaldi and Jenna Coleman participated in a photo shoot at Abbey Road, where, with the help of two Dalek props, they imitated the famous album cover produced by the Beatles. In costume as the Twelfth Doctor and Clara Oswald, Capaldi struck the same pose as John Lennon, though wearing his Doctor's sunglasses, while Coleman, in her bare feet, mimicked Paul McCartney.
- 2016 - Recording for The Wreck of the World took place at the Moat Studios.
- 2017 - Big Finish's Torchwood One audio anthology Machines was recorded at the Soundhouse.
- 2018 - The sixth series of Big Finish's audio series The Diary of River Song was recorded.