All the rich among the people shall entreat Thy countenance: after her shall virgins be brought to the King: her companions shall be brought to thee in gladness and rejoicing.
The Vigil of the Assumption of the Blessed Virgin Mary is a II Class day in its own right in the traditional liturgical calendar. It is a day of fasting and complete abstinence in preparation for tomorrow's feast.
Read: Pope Pius XII, Apostolic Constitution Munificentissimus Deus (1950). Defining the Dogma of the Assumption.