4 June 1927: birth of Geoffrey Palmer, who played Masters in Doctor Who and the Silurians (1970), the Administrator in The Mutants (1972), and Hardaker in Voyage of the Damned (2007). His son Charles Palmer directed four episodes of Doctor Who in 2007.
4 June 1933: birth of Ric Felgate, who played Roy Stone in The War Machines (1966), Brent in The Seeds of Death (1969), and Charles Van Lyden in The Ambassadors of Death (1970).
4 June 1940: birth of David Collings, who played Vorus in Revenge of the Cybermen (1975), Poul in The Robots of Death (1978), and Mawdryn in Mawdryn Undead (1983). He also played an alternate Doctor in the 2003 Big Finish audio Full Fathom Five, by Gary Russell.
4 June 1969: birth of Julie Gardner, Executive Producer of New Who from 2005 to 2008.
4 June 1980: birth of Philip Olivier, who plays the Seventh Doctor's companion Hex in Big Finish audios.
ii) broadcast anniversaries
4 June 1966: broadcast of second episode of The Savages. The Doctor works out what the Elders have been doing, but his life energy is drained by Jano.
4 June 2005: broadcast of Boom Town. The Doctor and Rose discover that a Slitheen is mayor of Cardiff and has sinister plans for the Blaidd Drwg nuclear power station.
4 June 2011: broadcast of A Good Man Goes To War.
iii) date specified in canon
4 June 1926: The crew of the SS Bernice vanishes from the Indian Ocean, becoming an exhibit in Vorg's Miniscope, as seen in Carnival of Monsters (1973).