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On 4月30日, the following important behind-the-scenes events were known to have occurred:
- 1965 - "The Executioners" was recorded at Riverside Studios 1. (TCH 5)
- 1968 - Pre-filming for The Dominators began at Ealing Studios Stage 2. (TCH 12)
- 1971 - Location filming for The Dæmons took place. (REF: Doctor Who The Handbook: The Third Doctor)
- 1973 - Studio filming for The Green Death took place at BBC Television Centre studio 3. (REF: Doctor Who The Handbook: The Third Doctor)
- 1974 - Location filming for Robot took place. (REF: Doctor Who The Handbook: The Fourth Doctor)
- 1974 - Studio filming for Planet of the Spiders took place at BBC Television Centre studio 8. (REF: Doctor Who The Handbook: The Third Doctor)
- 1975 - Location filming for Pyramids of Mars took place. (REF: Doctor Who The Handbook: The Fourth Doctor)
- 1980 - Location filming for State of Decay 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)
- 2005 - The Big Finish audio story Other Lives was recorded at the Moat Studios.
- 2008 - The Big Finish audio story Here There Be Monsters was recorded at the Moat Studios.
- 2011 - Jenna Coleman filmed her first scenes for Doctor Who.
- 2013 - The new executive producer for series 8 was announced to be Brian Minchin.
- 2014 - The Big Finish audio story The Widow's Assassin was recorded at the Moat Studios.
- 2015 - Big Finish's Torchwood - Monthly Range audio story The Conspiracy was recorded at the Moat Studios, the first of Big Finish Productions' relaunch of the Doctor Who spin-off Torchwood as an ongoing audio drama series.
- 2018 - Recording for Shellshock took place at Audio Sorcery.
- 2020 - Big Finish's audio adaptation of the unproduced TV story The Doomsday Contract and The Paternoster Gang audio anthology Heritage 4 were recorded.
- 2020 - Doctor Who: Lockdown! hosted a tweetalong of Dalek in commemoration of the episode's fifteenth anniversary.