December 17 -- Sapientiatide begins
The "O Antiphons", the special Magnificat antiphons for the seven days before Christmas (eight days, in the old English tradition) begin tonight.
O Sapientia, quæ ex ore Altissimi prodisti, attingens a fine usque ad finem, fortiter suaviterque disponens omnia: veni ad docendum nos viam prudentiæ.
O Wisdom, which camest out of the mouth of the Most High, and reachest from one end to another, mightily and sweetly ordering all things: Come and teach us the way of prudence.
Fr Mark posts an excellent meditation on the first O Antiphon here.