| 1 | ||||||
| 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| 23 | 24 | 25 | 26 | 27 | 28 | 29 |
| 30 | 31 |
On 5月21日, the following important behind-the-scenes events were known to have occurred:
- 1965 - "Journey into Terror" was recorded at Riverside Studios 1. (TCH 5)
- 1969 - Jon Pertwee signed his contract for his début season as the Third Doctor.
- 1970 - Studio filming for Inferno took place at BBC Television Centre 6. (REF: Doctor Who The Handbook: The Third Doctor)
- 1974 - Studio filming for Robot took place at BBC Television Centre studio 3. (REF: Doctor Who The Handbook: The Fourth Doctor)
- 1981 - Studio filming for The Visitation took place at BBC Television Centre studio 6. (REF: Doctor Who The Handbook: The Fifth Doctor)
- 1987 - Location filming for Paradise Towers took place. (Doctor Who The Handbook: The Seventh Doctor)
- 1993 - The BBC Radio 5 Live audio The Paradise of Death was recorded at Maida Vale 7. (REF: Doctor Who The Handbook: The Third Doctor)
- 1990 - Location filming for Search Out Space took place. (Doctor Who The Handbook: The Seventh Doctor)
- 2008 - The BBC formally announced Russell T Davies would step down as executive producer of Doctor Who in 2009, to be succeeded by Steven Moffat.
- 2008 - The Big Finish audio story The Doomwood Curse was recorded at The Moat Studios.
- 2019 - Big Finish's The Companion Chronicles audio anthology The First Doctor: Volume Three was recorded.
- 2019 - Big Finish's The Paternoster Gang box set Heritage 2 was recorded at The Soundhouse.
- 2019 - The Big Finish audio anthology The Twelfth Doctor Chronicles was recorded.
- 2020 - Big Finish announced the fifth and sixth series of their Doctor Who spin-off The War Master.
- 2021 - Big Finish's The Doctor Chronicles audio anthology Timejacked! was recorded at the Soundhouse.