Comic Relief
From Tardis Wiki, the free Doctor Who reference
Comic Relief is a British charity organization. The BBC is one of the main supporters of Comic Relief and airs TV specials during Red Nose Day, a donation campaign held every other March.
On 12th March 1999, the BBC aired an original Doctor Who parody story, The Curse of Fatal Death.
On 16th March 2007, David Tennant and Catherine Tate appeared in a televised skit which included numerous Doctor Who in-jokes.
On 13th March 2009, a mini-episode of The Sarah Jane Adventures will be aired.