i) births and deaths
26 June 1914: birth of John Bailey, who played the Commander in The Sensorites (First Doctor, 1964), Edward Waterfield in The Evil of the Daleks (Second Doctor, 1967) and Sezom in The Horns of Nimon (Fourth Doctor, 1980).
ii) broadcast anniversaries
26 June 1965: broadcast of "The Planet of Decision", sixth episode of the story we now call The Chase
26 June 2010: broadcast of The Big Bang, ending Season Five of New Who. How to summarise it? Multiple time lines, the Tardis explodes ending the Universe, and Amy and Rory leave their wedding reception too travel with the Doctor.
iii) dates specified in canon
26 June 1284: an alien energy entity posing as the Pied Piper kidnaps 130 children from Hamelin in Germany, as mentioned in the 2009 SJA story, The Day of the Clown.
26 June 2010: Rory Williams starts to travel with the Doctor and Amy, returning to Earth for their wedding, despite the end of the universe; after which they start to travel again.
45/51 have read the first Harry Potter. I’ve never actually gotten around to it so I’m 1 of the 6. It’s an interesting list, the Tannarive Due is on the pile next to the bed, not sure whether to go for it or the long way to a small angry planet next.
As always with this sort of thing you’re surprised both at what’s missing and what’s there, but what I have read of what’s there is pretty good.