6 August 1945: birth of Ron Jones, who directed Black Orchid (Fifth Doctor, 1982), Time-Flight (Fifth Doctor, 1982), Arc of Infinity (Fifth Doctor, 1983), Frontios (Fifth Doctor, 1984), Vengeance on Varos (Sixth Doctor, 1985) and Mindwarp (Sixth Doctor, 1986).
6 August 1980: birth of Tom Macrae, writer of Rise of the Cybermen/The Age of Steel (Tenth Doctor, 2006) and The Girl Who Waited (11th Doctor, 2011).
ii) broadcast anniversaries
6 August 1966: the BBC announced that William Hartnell would leave the role of the Doctor.
iii) dates specified in-universe
6 August 6048: setting of all but the last two chapters of Dale Smith's 2002 Seventh Doctor novel, Heritage.