Where I live, Christmas is the day that has the biggest celebration. There are some people, however, who have Christmas dinner on Christmas Eve and they also open their gifts on that night. I also know of some who have family gatherings on Boxing Day, the 26th December. However, Christmas Day is the main day for most people to have family gatherings with lunch or dinner, and the opening of gifts is also done on Christmas morning or Christmas night. Going to church on Christmas morning or to midnight mass, is also very popular here.