River Song changes fixed point in time
As shown in The Impossible Astronaut, the Doctor joins his friends at Lake Silencio and then approaches the astronaut, River Song, Amy and Rory's daughter, trained to kill the Doctor by the Silence. River, despite the Doctor's warning against interfering with such a fixed point as his death, surprises the Doctor by draining the astronaut suit's weapons systems and averting his death. Time becomes "stuck" as a result and begins to disintegrate; all of Earth's history begins to run simultaneously at a fixed moment of 5:02 p.m. on 22 April 2011. In London, Holy Roman Emperor Winston Churchill takes the Doctor, his "soothsayer", out from his locked cell to ask him about the condition of time. The Doctor explains the preceding events, but that tally marks are appearing on his arms, indicating the presence of the Silence...
The Doctor and River Song get married
Amy and Rory regroup with River and the Doctor. River tries to convince the Doctor that this frozen timeline is acceptable and that he does not have to die, but the Doctor explains that all of reality will soon break down. The Doctor marries River on the spot and whispers something in her ear, declaring that he had just told her his name. He then requests that River allow him to prevent the universe's destruction. The two kiss, and reality begins to return to normal.