We are now in the brief liturgical season of Ascensiontide. In the Dominican Breviary, the ferial office in Ascension season is similar to that of the Roman Breviary, with slight differences. The invitatory at Matins is different, as is the Benedictus antiphon at Lauds is different, and the hymn at Vespers, to name a few.
Though this season is short, and is overshadowed by the looming arrival of Pentecost, it is a beautiful liturgical season nonetheless. The ferial days in Ascensiontide are IV Class, so when a III Class feast occurs on the calendar, no commemoration is made of the ferial office.