This article about a day of the year is currently under construction. It's likely to be a bit messy.
On 21 June, the following important behind-the-scenes events were known to have occurred:
- 1966 - Location filming for The Smugglers continued. (TCH 8)
- 1968 - Episode one of The Mind Robber was recorded at BBC Television Centre Studio 3. (TCH 13)
- 2010 - Recording for Lurkers at Sunlight's Edge took place at The Moat Studios.
- 2012 - Recording for Wirrn Isle took place at The Moat Studios.
- 2019 - Recording for The Robots: Volume One took place at the Moat Studios.