Eurovision Song Contest

The Eurovision Song Contest was an annual competition held among the nations of Europe. Jack Harkness remembered when ABBA won the Eurovision Song Contest. (AUDIO: The Dead Line)

Eurovision pastiche in the DWU
The Intergalactic Song Contest and its commentator Logan from AUDIO: Bang-Bang-A-Boom! spoofed the Eurovision Song Contest and its commentator.

Doctor Who postponements
The Eurovision Song Contest was responsible for the one-week delay of two episodes of the BBC Wales revival of Doctor Who. The transmission of Series 3's 42 was postponed to the 19th of May (rather than the 12th) because of the BBC's broadcast of the 2007 of the  Eurovision Song Contest. Next year, the transmission of Series 4's Silence in the Library was delayed by one week due to the BBC's broadcast of the 2008 of the  Eurovision Song Contest.

Coexistance with Eurovision
However, a more common occurance is a Doctor Who episode simply airing on the day and coexisting with the Eurovision final rather than being delayed by a week.
 * The Empty Child aired on the same night as the final of the 2005.
 * The Age of Steel aired on the same night as the final of the 2006.
 * Cold Blood aired on the same night as the final of the 2010.
 * The Doctor's Wife aired on the same night as the final of the 2011.
 * The Name of the Doctor aired on the same night as the final of the 2013.

"Nul points."
The Ninth Doctor says ".", a phrase used when an Eurovision act is unfortanute enough to receive no points, when the Daleks fail to kill him when they fire at him as he steps out of his TARDIS to meet them in TV: The Parting of the Ways, due to the force field he installed. However, the phrase's connection to the Eurovision Song Contest is not explicitly mentioned within the episode.