19 August 1969: birth of S.P. Krause, who developed the 2009-10 K9 series and co-wrote seven of its episodes.
ii) broadcast anniversaries
19 August 2011: broadcast of Torchwood episode Immortal Sins, mostly a flashback to Jack’s time in New York in 1927.
iii) dates specified in-universe
19 August 1572: The Doctor and Steven land in Paris; the Doctor goes off to consult the apothecary Charles Preslin while Steven falls in with Huguenots, and the Abbot of Amboise arrives in Paris; guess who he looks like? (as shown in The Massacre, 1966)
19 August 1983: birth of Ianto Jones, later to join Torchwood, as revealed in Fragments (2008).