i) births and deaths

9 April 1972: birth of Neve McIntosh, who played both Alaya and Restac in The Hungry Earth / Cold Blood (Eleventh Doctor, 2010) and Madame Vastra in later stories
ii) broadcast anniversaries

9 April 1966: broadcast of "The Hall of Dolls", second episode of the story we now call The Celestial Toymaker. Steven and Dodo, competing with the King and Queen of Hearts, must find the two safe chairs to sit in.
9 April 2005: broadcast of The Unquiet Dead. The Doctor and Rose, with the help of Charles Dickens, investigate reanimating corpses in Cardiff in 1869.
9 April 2013: Strax reports from Trafalgar Square.