... does not, of course, exist, either in the OF calendar or in the (already heavily reformed) books of 1962. Except vestigially; the old Octave Day was made the Feast of our Lady's Immaculate Heart in 1944 by Pope Pius XII. One of the changes made in the post-Conciliar Calendar which I find very attractive is the movement of the Feast of our Lady, Queen, originally placed on May 31 by Pius XII in 1955, to this slot. The reasons for associating this observance with the Assumption cycle are too obvious to need spelling out. The great fourteenth bishop of Exeter John de Grandisson (whom old lags in the reading of this blog will remember I have mentioned several times) arranged to have his enthronement on August 22 and (although it was not the anniversary of his death) to have his obit kept on the day following (is such a practice common?). Naturally; he was a devoted client of our Lady, particularly under the title of Mater Misericordiae, and his devotion seems to have been very much along the lines of that recommended by S Louis Grignion de Montfort.
I suppose an unofficial repetition of the Assumption Mass on the days within the Octave is contrary to current rules both in OF and EF; votive masses of events in the life of our Lord and his Mother are, with the exception of the Immaculate Conception, not allowed. One could, however, say ordinary votives of our Lady. I would like to see restored, as an optional Votive, the old Gaudeamus mass of the Assumption, the one superseded in 1950. It makes an important point about the Assumption: that we ought to see that mystery in terms of our Lady's mediatorial role. The Collect: it is Mary's intercession we need to be saved; the Secret: she has migrated so that we may sense her intercession in heavenly glory; the Postcommunion: it is by her intercession that we pray to be delivered a cunctis malis imminentibus.