Practices associated with Advent include keeping an Advent calendar, lighting an Advent wreath, praying an Advent daily devotional, erecting a Christmas tree or a Chrismon tree, lighting a Christingle, as well as other ways of preparing for Christmas, such as setting up Christmas decorations, a custom that is sometimes done liturgically through a hanging of the greens ceremony. The equivalent of Advent in Eastern Christianity is called the Nativity Fast, but it differs in length and observances, and does not begin the liturgical church year as it does in the West. The Eastern Nativity Fast does not use the equivalent "parousia" in its preparatory services.