Weddings were ceremonies in which two people were married.
The Doctor
Over the course of his life the Doctor was married more than once.
The Doctor and River Song get married - Doctor Who - The Wedding of River Song - Series 6 - BBC
The Eleventh Doctor marries River Song. (TV: The Wedding of River Song)
In 1562, the wedding between the Tenth Doctor and Queen Elizabeth I was attended by the Eleventh Doctor, Clara Oswald and the War Doctor. This came about after the Tenth Doctor accidentally proposed to her in a ploy to prove that the Queen was in fact a Zygon. When it turned out that it was instead his horse that was the Zygon, though, he was forced to carry through with the marriage. (TV: The Day of the Doctor)
In 1952 Hollywood, the Eleventh Doctor accidentally found himself engaged to Marilyn Monroe, and ended up having to leave the party with her to get married. Marilyn got his phone number and attempted to call him, but he denied the legitimacy of the chapel where they were apparently married. (TV: A Christmas Carol)
In 1782, a wedding ceremony was held between the Eighth Doctor and Scarlette. (PROSE: The Adventuress of Henrietta Street)
The Tenth Doctor once told Sally Sparrow that due to time travel he was "rubbish at weddings, especially my own." (TV: Blink)
On 22 April 2011 of an alternate timeline, the wedding of River Song and the Eleventh Doctor was held on top of the Great Pyramid of Giza. (TV: The Wedding of River Song)
Weddings of the Doctor's companions
In 1986, the Ninth Doctor and Rose Tyler attended the wedding of Pete Tyler and Jackie Prentice. A year later, Pete and Jackie attended the wedding of Stuart Hoskins and Sarah Clark, during which Pete was hit by a car outside the church and killed. (TV: Father's Day)
The Seventh Doctor originally did not attend the wedding of Alistair Gordon Lethbridge-Stewart and Doris, but later changed time to a minor extent so that he did attend it. (PROSE: A Romantic Evening)
On 29 October 2009, the wedding of Sarah Jane Smith and Peter Dalton was revealed to be part of the Trickster's scheme and averted with help from the Tenth Doctor. (TV: The Wedding of Sarah Jane Smith)
In April 2010, the Seventh Doctor assembled the guests and musicians for the wedding of Bernice Summerfield and Jason Kane in Cheldon Bonniface. (PROSE: Happy Endings)
On 26 June 2010, the Eleventh Doctor attended the wedding of Amy Pond and Rory Williams. (TV: The Big Bang)
Amy Pond later accidentally married Henry VIII on her anniversary with her proper husband, Rory Williams. Her excuse was that she just heard someone talking and said "yes." (TV: The Power of Three)
The Fourth Doctor interrupted the wedding of Romana and Count Grendel on Tara. (TV: The Androids of Tara)
The Sixth Doctor did not attend the wedding of Evelyn Smythe and Justice Rossiter, much to her disappointment. (AUDIO: Thicker Than Water)
In 3999, the Eighth Doctor attended the wedding of Stacy Townsend and Ssard on Micawber's World. (PROSE: Placebo Effect)
The Fifth Doctor expressed regret at not being able to attend the wedding of Leela and Andred on Gallifrey. (TV: Arc of Infinity)
Donna Noble
Doctor Who - Donna kidnapped by The Doctor - BBC
Donna Noble is "abducted" as she walks down the aisle. (TV: The Runaway Bride)
On 24 December 2007, the wedding of Donna Noble and Lance Bennett was interrupted when she was transported to the Tenth Doctor's TARDIS. (TV: The Runaway Bride)
Donna later married Lee McAvoy while in CAL's virtual world. The two lived a virtual life until the Tenth Doctor and River Song freed them from the virtual world. Donna was unable to find Lee again afterwards even though he was real and not a construct of the virtual world. (TV: Forest of the Dead)
After Donna stopped travelling with the Doctor, she got married again in spring of 2010, this time to Shaun Temple. The Tenth Doctor secretly attended this wedding. The first and last time the Doctor saw Donna, she was in a wedding dress. As a final gift to Donna, the Doctor gave her a lottery ticket to ensure her and her new husband's financial future bought with money borrowed from her deceased father. (TV: The End of Time)
Other
In 1986, the Ninth Doctor and Rose Tyler attended the wedding of Pete Tyler and Jackie Prentice. A year later, Pete and Jackie attended the wedding of Stuart Hoskins and Sarah Clark, during which Pete was hit by a car outside the church and killed. (TV: Father's Day)
In 2009, the wedding of Gwen Cooper and Rhys Williams was complicated by the activities of a Nostrovite. (TV: Something Borrowed)
Nyssa was present at the wedding of her father and her stepmother on Traken. The union was blessed by the Keeper of Traken. (TV: The Keeper of Traken)
Once, Donna Noble attended the wedding of her friend Ginny, and was thrown out of the church by a monk. (PROSE: Most Beautiful Music)