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On 4月28日, the following important behind-the-scenes events were known to have occurred:
- 1966 - Pre-filming for The Savages concluded at Ealing Studios. (TCH 8)
- 1967 - Pre-filming for The Evil of the Daleks continued on Stage 3A/B of Ealing Studios. (TCH 10)
- 1968 - Location filming for The Dominators continued at Olley Sand Pit. (TCH 12)
- 1971 - Location filming for The Dæmons took place. (REF: Doctor Who The Handbook: The Third Doctor)
- 1974 - Location filming for Robot took place. (REF: Doctor Who The Handbook: The Fourth Doctor)
- 1981 - Studio filming for Four to Doomsday took place at BBC Television Centre studio 6. (REF: Doctor Who The Handbook: The Fifth Doctor)
- 1982 - Studio filming for Snakedance took place at BBC Television Centre studio 6. (REF: Doctor Who The Handbook: The Fifth Doctor)
- 1988 - Studio filming for Remembrance of the Daleks took place at BBC Television Centre Studio 8. (Doctor Who The Handbook: The Seventh Doctor)
- 2001 - The Big Finish audio story The One Doctor was recorded at the Moat Studios.
- 2005 - The first draft script for the story which would become Rise of the Cybermen and The Age of Steel was submitted. (DWMSE 14)
- 2005 - The Big Finish audio story Scaredy Cat was recorded at the Moat Studios.
- 2009 - Big Finish's audio adaptation of the unmade TV story Leviathan was recorded at the Moat Studios.
- 2010 - The Big Finish audio story A Death in the Family was recorded at the Moat Studios.
- 2017 - Big Finish's audio anthology The Third Doctor Adventures: Volume Three took place at the Soundhouse.
- 2020 - Big Finish's The Paternoster Gang audio anthology Heritage 4 was recorded remotely.
- 2021 - Big Finish's audio anthologies The Third Doctor Adventures: Volume Eight and Torchwood Soho: Ashenden were recorded.
- 2021 - Big Finish announced the two-part Fifth Doctor Adventures audio anthology Forty.