In recent times the most common observance of Advent outside church circles has been the keeping of an advent calendar or advent candle, with one door being opened in the calendar, or one section of the candle being burned, on each day in December leading up to Christmas Eve. In many countries, the first day of Advent often heralds the start of the Christmas season, with many people opting to erect their Christmas trees and Christmas decorations on or immediately before Advent Sunday.