When I first did these posts ten years ago, I skipped today for some reason. (Probably because I was enduring my first visit to South Sudan.) 
23 July 1992: birth of Tosin Cole, who plays the Thirteenth Doctor's companion Ryan Sinclair (2018-present).
ii) broadcast anniversaries
None.
iii) dates specified in-universe
23 July 1790: setting of the first two episodes of the story we now call The Reign of Terror (First Doctor, 1964)
23 July 2012: Jane McKillen disappears from Dame Kelly Holmes Close, as seen in Fear Her (Tenth Doctor, 2006).
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