"Harry had never in all his life had such a Christmas dinner. A hundred fat, roast turkeys; mountains of roast and boiled potatoes; platters of chipolatas; tureens of buttered peas, silver boats of thick, rich gravy and cranberry sauce — and stacks of wizard crackers every few feet along the table... Harry pulled a wizard cracker with Fred and it didn't just bang, it went off with a blast like a cannon and engulfed them all in a cloud of blue smoke, while from the inside exploded a rear admiral's hat and several live, white mice."
—Description of the Christmas feast[src]
The Christmas holidays is the time of the year when students of Hogwarts School of Witchcraft and Wizardry have the option to go home via the Hogwarts Express for Christmas, or to stay in the castle. However, if one stays, there are no classes. The holidays are two weeks long.

Celebrations at Hogwarts

Christmas feast at Hogwarts

Christmas feast

At this time, the school is decorated and the Great Hall is filled with The Twelve Christmas Trees. On Christmas Day there is the feast, during which the remaining students and teachers tuck into mountains of roast turkeys, potatoes and chipolatas. The tables in the Great Hall are strewn with wizard Crackers, wonderful crackers that sound like gunshots when pulled and are filled with real sized hats, wizard chess sets, live mice and jokes.