Traditions of Christmas Bells
Bells, especially Church Bells, have traditionally been associated with Christmas for a long time. In the Anglican and Catholic churches, the church day starts at sunset, so any service after that is the first service of the day. So a service on Christmas Eve after sunset is traditionally the first service of Christmas day! In churches that have a Bell or Bells, They are often rung to signal the start of this service.
In some churches in the UK, it is traditional that the largest bell in the church is rung four times in the hour before midnight and then at midnight all the bells are rung in celebration.
In the Catholic Church, Christmas and Easter are the only times that Mass is allowed to be held at Midnight. It's traditional that at both midnight Masses, the church and altar bells too in many cases are rung while the Priest says the "Gloria" (Gloria in excelsis Deo).
Having a Mass at Midnight at Christmas dates back to the early church, when it was believed that Jesus was born at midnight, although there has never been any proof of this! A lot of Churches have midnight services on Christmas Eve, although not every church will have a mass or communion as part of the service.
In Victorian times, it was very fashionable to go carol singing with small handbells to play the tune of the carol. Sometimes there would only be the bells and no singing! Handbell ringing is still popular today.