8 July 1978: birth of the very watchable Eve Myles, who plays Gwen Cooper in Torchwood (and also appeared in The Unquiet Dead with the Ninth Doctor in 2005). Mmmmmm.
9 July 1907: birth of Eric Chitty, who was Charles Preslin in the 1966 First Doctor story we now know as The Massacre (lost, alas) and Co-ordinator Engin in The Deadly Assassin (Fourth Doctor, 1976).
8th July 2006: death of Peter Hawkins, who did the voices of the Daleks, the Cybermen, Bill and Ben the Flowerpot Men, Captain Pugwash, and Zippy in the first season of Rainbow.
ii) broadcast anniversary
8 July 2006: broadcast of Doomsday, the last episode of Season 2 of New Who, with Daleks vs Cybermen, and Rose Tyler swept off to a parallel universe; RTD's last really satisfactory finale, and even then the kids I was watching it with (both of whom, incidentally, are now professional footballers) got a bit bored with Billie Piper's make-up smearing. It worked for me, though I was totally confused by the ending as I was not really aware of Catherine Tate.
8 July 2009: broadcast of the third episode of Torchwood: Children of Earth, as the 456 arrive in their gas-filled chamber and demand 10% of all of humanity's children; meanwhile Jack reveals that he handed over the children they took away in 1965.
8 July 2011: broadcast of The New World, first episode of the fourth series of Torchwood. One day, nobody dies; death has stopped for the whole human race. CIA agent Rex Matheson discovers the existence of Torchwood and goes to Wales.
iii) date specified in-universe
8 July 1974 saw the opening of the London exhibition of Princess Hentopet's Art, in the 2008 Tenth Doctor comic story Agent Provocateur.