On 23 October, the following important behind-the-scenes events were known to have occurred:
- 1964 - "Flashpoint" was recorded at Riverside Studios 1, bringing Carole Ann Ford's tenure on Doctor Who to a close. (INFO: The Daleks Invasion of Earth)
- 1999 - Recording for The Marian Conspiracy took place.
- 2008 - Recording for The Eight Truths and Worldwide Web took place at The Moat Studios.
- 2009 - Recording for Echoes of Grey took place at The Moat Studios.
- 2012 - Recording for the second series of Counter-Measures took place at The Moat Studios.
- 2018 - Recording for The Monsters of Gokroth took place at the Moat Studios.
Community content is available under CC-BY-SA unless otherwise noted.