Herewith a few notes on the Office this week - this may or may not become a regular feature depending on whether or not people find it useful (let me know), and how much time it takes to compile. All page references are to the Monastic Diurnal (Farnborough edition).
Please do let me know if you find (or think there may be) any mistakes in the Ordo or notes.
The season is currently 'time throughout the year', so select all antiphons etc accordingly.
Saturday June 19 – I Vespers of the Fourth Sunday after Pentecost
The Magnificat antiphon (MD 445*) refers to the readings for Matins, I Samuel 17, which starts the story of David and Goliath.
Sunday June 20 – Fourth Sunday after Pentecost, Class II
At Lauds use the first psalm schema (Ps 50, 117, 62) and Hymn Ecce Iam Noctis.
The Benedictus and Magnificat antiphons (MD 463-4*) refer to the Gospel set for this Sunday, Luke 5.
All the rest is as for Sundays throughout the year.
Mon 21 – St Aloysius Gonzaga, Confessor, Memorial
here. For the commemoration at Lauds (made after the collect for the week, from Sunday at MD 464*), see MD .
All the rest is as for Mondays throughout the year.
Tuesday June 22 – Class IV
All as for Tuesdays throughout the year, with the collect of the previous Sunday, MD 464*.
Wed 23 – Vigil of St John the Baptist, Class II
St John the Baptist is regarded as the last of the Old Testament prophets; he is the only saint apart from Our Lady whose earthly birth, by virtue of its significance in foreshadowing that of Our Lord's, is celebrated in the calendar.
The Office today (up until Vespers) is said as for a Wednesday throughout the year, but instead of the Sunday collect, the collect for the day, set out on MD  is used. Vespers is I Vespers for the feast - psalms are from the Common of Apostles, MD (2)ff, with antiphons and proper texts from MD  ff.
Thurs 24 – Nativity of St John the Baptist, Class I
At Lauds, use the festal psalms of Sunday (PS 92 etc) with the antiphons and other texts set out at MD  ff. At Prime use the first antiphon at Lauds, and the rest as set out in the Diurnal. At Vespers, use the antiphons from Lauds (omitting the fourth) with the psalms from the Common of Apostles.
Fri 25 – Class IV
All as for Fridays throughout the year, with collect of Sunday, MD 464*.
Sat 26 – Saturday of Our Lady; SS John and Paul, Martyrs, memorial
martyrs under the reign of Julian the Apostate. Their tombs were found below the Church dedicated to them in Rome, pictured left.