Many companies and business offices that let their employees dress in their ugly Christmas sweaters at work. Usually they can be worn every day throughout December, for just the week of Christmas or one day that either the company handbook or supervisor specifies. Employers host ugly Christmas sweater parties too where employees can celebrate the holidays by coming to work dressed in their ugly sweaters. Many people host or go to ugly Christmas sweater parties. These parties are held at buildings that have been rented for large social gatherings, clubs, at restaurants or in people's homes. Wearing those ugly sweaters is one way that Christmas is popularly celebrated.