September 10th, 2013.
Doctor Who 50th Anniversary Live Pre-Show - 2013 TV was released on: USA: 23 November 2013
The 50th anniversary episode, "The Day of the Doctor", was aired on 23 November 2013.
NBC 50th Anniversary - 1976 TV was released on: USA: 21 November 1976
Yes, David Tennant did appear in the 50th anniversary episode of Doctor Who, called The Day of the Doctor.
Superman 50th Anniversary - 1988 TV is rated/received certificates of: Finland:K-11 (2006)
The date for the anniversary is the 23rd November 2013
Looney Tunes 50th Anniversary - 1986 TV is rated/received certificates of: UK:U USA:G
Looney Tunes 50th Anniversary - 1986 - TV was released on: USA: 14 January 1986
The Osmonds 50th Anniversary Reunion - 2008 TV was released on: USA: 2 March 2008
Candid Camera's 50th Anniversary - 1996 TV was released on: USA: 29 August 1996
Walt Disney's 50th Anniversary Show - 1973 TV is rated/received certificates of: Finland:S
American Bandstand's 50th Anniversary Celebration - 2002 TV was released on: USA: 3 May 2002