The calendar this week - Holy Week
Sun 24 Mar Second Passion Sunday or Palm Sunday, Class I
Mon 25 Mar Monday in Holy Week, Class I
Tues 26 Mar Tuesday in Holy Week, Class I
Wed 27 Mar Wednesday in Holy Week, Class I
Thur 28 Mar Maundy Thursday, Class I
Fri 29 Mar Good Friday, Class I
Sat 30 Mar Holy Saturday, Class I
The first days of Holy Week are all first class days.
For those who say it, Matins each day has two nocturns/three readings, with the invitatory antiphon and hymn of Passiontide.
Lauds to None have proper antiphons for each day, with other texts from the ordinary of Passiontide.
Vespers uses the usual antiphons from the psalter, with a proper canticle and collect.
The Office during the Triduum
The Office during the Triduum does not follow the normal form as set out in the psalter. In addition, some of the Holy Week ceremonies include parts of the Office so that those who attend them do not need to sing or say those particular hours separately.
Matins and Lauds: The Office of Tenebrae, or Matins and Lauds, is a special feature of the Triduum. It is said in darkness, and a candle is extinguished as each of the psalms is said, and the Roman (EF) and Benedictine forms of this Office are identical.
The 1962 rubrics specify that Tenebrae is not be anticipated, or said the night before. As this generally makes public recitation of the Office impractical outside a monastery, it is generally ignored. Thus the normal practice is to perform Tenebrae for Maundy Thursday on Wednesday night, and so forth. Note that the Diurnal does not contain the Matins psalms for Tenebrae, so you will need to obtain these from elsewhere should you wish to say it in full.
If Tenebrae is sung in the evening, Compline should be said beforehand.
Prime to None: The psalms for Prime, Terce, Sext and None during the Triduum are set out on MD 279* ff. No introductory prayer or hymns are said, and the Gloria Patri is not said at the end of each psalm. Each hour closes the antiphon ‘Christus factus est’ – each day of the Triduum, an additional phrase of the antiphon is added, as set out on MD 282*.
Vespers: Vespers (if said) is often said quite early, in order to make room for Tenebrae/the Easter Vigil. The antiphons and psalms for Vespers can be found on MD 296* ff.
Note that there are no introductory prayers; as for the other hours, the Gloria Patri is not said at the end of each psalm; the first psalm on Holy Saturday is on MD 298*; antiphons for the Magnificat each day are on MD 303*; on Maundy Thursday and Good Friday, the antiphon Christus factus est is said; and on the concluding prayers for Holy Saturday, see MD 305*.
Compline: The rubrics for Compline from Maundy Thursday to Holy Saturday are set out on MD 305* ff. Note the addition of the Nunc Dimittis.