Christmas Day is a holiday in many, but not all, countries. Many homes have Christmas trees and other decorations in the weeks leading to Christmas Day. Some workplaces hold Christmas parties prior to December 25. Festive activities include exchanging presents, singing Christmas songs, going to parties. For some, Christmas is an exclusive family affair, while others invite friends to a Christmas buffet or pot luck meal. Churches have special services and may include a crèche or miniature Nativity scene. It's a special time when children get presents from family, friends and Santa Claus, or Father Christmas. Christmas cards are also given or sent out prior to Christmas Day.