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On 4月15日, the following important behind-the-scenes events were known to have occurred:
- 1965 - Pre-filming for The Chase concluded at Ealing Studios Stage 3A/B. The filming of the battle between the Daleks and the Mechonoids was completed. (TCH 5)
- 1966 - "A Holiday for the Doctor" was recorded at BBC Television Centre Studio 4. (TCH 7)
- 1967 - Episode three of The Faceless Ones was recorded at Lime Grove Studios D. (TCH 10)
- 1981 - Studio filming for Four to Doomsday took place at BBC Television Centre studio 6. (REF: Doctor Who The Handbook: The Fifth Doctor)
- 1989 - Location filming for The Curse of Fenric took place. (Doctor Who The Handbook: The Seventh Doctor)
- 2000 - The script to The Eleven Day Empire is written.
- 2008 - The Big Finish audio story The Boy That Time Forgot was recorded at the Moat Studios.
- 2015 - Disney XD picked up the rights to air Doctor Who's second, third, and fourth series.[1]
- 2020 - The Big Finish audio stories He Kills Me, He Kills Me Not, The Enemy of My Enemy and Mutually Assured Destruction were recorded remotely.