Today, in the 1962 Dominican Rite Calendar, we celebrate the feast of the Blessed Virgin Mary of the Rosary. The feast is I Class in the calendar of the Dominican Order, so the festive office is prayed according to the rubrics. Traditionally, Dominican Tertiaries would fast on the vigil of this great feast. The hymns at 1st Vespers, Matins, and Lauds celebrate the three traditional groupings of mysteries...the Joyful, Sorrowful, and Glorious. You can download the entire English translation of the office here.
The great feast was announced at Pretiosa yesterday:
The Commemoration of Our Lady of Victory, which Pope Plus V instituted to be made annually, on account of the famous victory gained on this very day by the Christians in a naval battle against the Turks, by the assistance of the same Mother of God. However, Gregory XIII decreed that for the same victory there should be celebrated on the first Sunday of this month the annual solemnity of the Rosary of the Most Blessed Virgin.