It's Advent
It's now Advent, the time when Catholics and some Protestant denominations prepare themselves for the coming of Christ. This isn't merely a time of preparation for the feast of Christmas. It also reminds us that Christ will come again in glory, and so it's a reminder that we need to prepare ourselves for His coming so that we may be worthy to be in His presence. So, in this time Catholic Churches will not (or probably more accurately, should not) be singing Christmas hymns, but rather Advent hymns. The most famous Advent hymn is "O Come, O Come Emmanuel," which is commonly played as a Christmas song, but given its obvious anticipation of Christ's coming is properly understood as an Advent hymn.
So take some time in the next three and a half weeks, examine yourself, make sure you're ready for the coming of Christ. Because we don't know when He will come, only that it will be unexpectedly.
More information: CATHOLIC ENCYCLOPEDIA: Advent