24 December is the last day of Advent and the day to which the Great O Antiphons have been pointing.
Each antiphon has addressed the coming Christ by a different title and begged Him to come and help His people:
December 17: O Sapientia (O Wisdom)
December 18: O Adonai (O Lord)
December 19: O Radix Jesse (O Root of Jesse)
December 20: O Clavis David (O Key of David)
December 21: O Oriens (O Dayspring)
December 22: O Rex Gentium (O King of the Nations)
December 23: O Emmanuel (O With Us is God)
Those names form a reverse acrostic containing his answer, which is not unlike the answer he gives at the conclusion of Christian Scriptures.
Sapientia
Adonai
Radix Jesse
Clavis David
Oriens
Rex Gentium
Emmanuel
SARCORE <——> Ero cras (I will be [with you] tomorrow.)
The Church begs Him to come; He replies that His coming is imminent. Tomorrow, 25 December, is the first day of Christmas.
“The Spirit and the Bride say, ‘come!’…. The One Who testifies says, ‘indeed, I am coming quickly.’ Even so, come, Lord Jesus.
“The grace of our Lord Jesus Christ be with you all. Amen.”