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On 3月15日, the following important behind-the-scenes events were known to have occurred:
- 1967 - Model filming for The Faceless Ones began on Stage 3 of Ealing Studios. (TCH 10)
- 1973 - Location filming for The Green Death took place. (REF: Doctor Who The Handbook: The Third Doctor)
- 1974 - Location filming for Planet of the Spiders took place. (REF: Doctor Who The Handbook: The Third Doctor)
- 1983 - Location filming for The Five Doctors took place. (REF: Doctor Who The Handbook: The Fifth Doctor)
- 2006 - The final edit and dub for Tooth and Claw was prepared. (DWMSE 14)
- 2018 - Big Finish announced the first series of Lady Christina.
- 2019 - Big Finish's audio anthology The Eighth Doctor: Time War: Volume Three was recorded.