This article about a day of the year is currently under construction. It's likely to be a bit messy.
On 20 December, the following important behind-the-scenes events were known to have occurred:
- 1963 - "The Expedition" was recorded at Lime Grove Studios. (INFO: "The Expedition")
- 1967 - Pre-filming for The Web of Fear began at Ealing Studios Stage 3. Location filming also took place on the Ealing Studios backlot. (TCH 11)
- 2010 - Recording for Heroes of Sontar took place at The Moat Studios.
- 2012 - Recording for Jago & Litefoot: Series Seven took place at The Moat Studios.