Christmas is a primarily Christian holiday celebrated on the 25 December in most countries (including the United Kingdom). The most famous tradition of Christmas is that Santa Claus flies around the world to deliver presents to all the good children of the world. Students at Hogwarts School of Witchcraft and Wizardry go on a few weeks' holidays for the Christmas season -- though some students (such as Harry Potter) choose to stay at Hogwarts. It is not known what religious connotations the holiday has to the Wizarding world.
For Christmas at Hogwarts, the Great Hall is decorated with twelve towering Christmas trees, festoons of holly, mistletoe, and other Christmas oriented accents. In addition this, the school has been known to be decorated with real live fairies which fly around the trees, everlasting icicles which are applied to the banisters of the Grand Staircase, and warm, dry snow which falls from the Enchanted Ceiling of the Great Hall. Also, the suits of armour around Hogwarts have been known to be charmed to sing carols.
The students can choose to stay at Hogwarts Castle or return home for the holidays, which begin shortly before Christmas Day and end sometime after New Year's Day. A Professor generally goes among the students making a list of those who want to stay for the winter holidays. A notable occasion upon which a majority of students stayed at Hogwarts for Christmas was in 1994, when Hogwarts hosted the Triwizard Tournament and the Yule Ball held on Christmas Day. On Harry Potter's first Christmas at Hogwarts, it had been by far the best Christmas he had ever had.
Ron Weasley - a Chudley Cannons hat from Harry, a pair of violet socks and a jumper from his mother (both of which were given to Dobby).After paying ten Galleons for a pair of Omnioculars to give Ron at the 1994Quidditch World Cup, Harry had jokingly told him that he wasn't getting a Christmas present for ten years.
Dobby - an old pair of mustard yellow socks from Harry Potter, a pair of violet socks and a jumper from Ron Weasley