Carol singer
From Tardis Wiki, the free Doctor Who reference
Carol singers were those who sang Christmas carols.
Carol singers sang "Deck the Halls", "O Come, All Ye Faithful", "God Rest You Merry, Gentlemen" and "Silent Night" outside Maisie Johnson's house. (PROSE: The Gift)
Opening her door at Christmas, Amy Pond threatened to use a water pistol against potential carol singers only to be reunited with the Eleventh Doctor. (TV: The Doctor, the Widow and the Wardrobe) The Eleventh Doctor encountered carol singers in Sardicktown. (TV: A Christmas Carol)
The Twelfth Doctor once put a sign up on the TARDIS doors cautioning that "Carolers will be criticised." (TV: The Husbands of River Song)