Advent is not simply an early extension of the Christmas season. Some Christians may become confused because their churches may not distinguish Advent themes from Christmas themes very well. Some churches that celebrate Advent do so with just an Advent wreath and a few readings, while the sermons and hymns are clearly related thematically to Christ's birth, and not his first and second comings (the actual theme of Advent). Another reason for confusion is that secular society celebrates Christmas earlier and earlier each year, and ignores Advent entirely, which makes it difficult for Christians to focus on Advent.
Technically, the liturgical Christmas season begins on Christmas day and continues after Christmas.. This is why all Catholic churches only begin to sing Christmas carols and hymns on Christmas day. This is the correct way to celebrate Christmas and Advent, and avoid an Advent Christmas mix-up.
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