The Octave Before Christmas
December 17-23"The O Antiphons refer to the seven antiphons that are recited (or chanted) preceding the Magnificat during Vespers of the Liturgy of the Hours. They cover the special period of Advent preparation known as the Octave before Christmas, Dec. 17-23, with Dec. 24 being Christmas Eve and Vespers for that evening being for the Christmas Vigil."
December 23
"O Emmanuel, our King and Giver of Law:
come to save us, Lord our God!"