Votive Masses of IV Class
A Votive Mass of IV Class may only be celebrated on a liturgical day of IV Class. The Gloria is not said, except in Masses of the Angels on any day of the week and in Masses of the BVM celebrated on a Saturday. The Creed is never said. Two commemorations are allowed. Days on which it may be celebrated are indicated thus: † or ‡, the latter indicating that Requiem Masses of IV Class may also be celebrated.
(Gen. Rub. of Missal 387-389)
External Solemnity
By this term is meant the celebration of the Mass of a feast without its Office when, for the good of the faithful, it is celebrated on a Sunday or some other day.
Normally only 2 Low Masses, or 1 Low and 1 High or Sung Mass, are allowed. An External Solemnity may not be celebrated on a 1st Class Sunday or 1st Class feast.
Votive Masses
It was formerly allowed to say the following as chapter Masses in cathedrals or Conventual Masses in monasteries, but only on ordinary feral days and on fixed days of the week:
Monday: The Mass of the Most Holy Trinity.
Tuesday: that of the Holy Angels.
Wednesday: that of St. Joseph, Peter and Paul OR the Holy Apostles.
Thursday: that of the Holy Ghost, the Blessed Sacrament, or Jesus Christ the Eternal High-Priest.
Friday: that of the Holy Cross, or of the Passion of Our Lord.
Saturday: that of the Blessed Virgin.
According to the revised Rubrics these Votive Masses may now be said on any day of the fourth class.
In his book from 1960, The New Rubrics of the Roman Breviary and Missal (available here), Rev. P. L. Murphy says in regard to votive Masses:
OUR LADY
As a votive Mass of our Lady any of the following may be chosen:
(a) in the universal Church, the Masses of our Lady on Saturday, according to the different seasons, and also all the Masses of the feasts of our Lady which are inscribed in the universal calendar;
(b) in a particular church, in addition to the above, all the Masses which are inscribed in the particular calendar, or specially granted.
However, with the exception of the Immaculate Conception, Masses which refer to the mysteries of the life of our Lady may not be chosen as votive Masses (309).
In practice, then, any of the following may be chosen as votive Masses of our Lady: Saturday Masses of our Lady, Immaculate Conception, Immaculate Heart, Queenship of Mary, Holy Name of Mary, Our Lady of the Rosary, our Lady of Mount Carmel, our Lady of Ransom, Apparition of the Immaculate Virgin Mary, our Lady Help of Christians (for the whole of Australia and New Zealand), our Lady of Perpetual Succour and our Lady of Good Counsel (for those dioceses in which these feasts are celebrated).
The formulary for the above Masses of our Lady will be the Mass of the feast, unless another Mass is expressly indicated (315). Any parts of the Mass of the feast that may be wanting are supplied from the Common of feasts of our Lady (309 b).
pp. 175-6.
If your priest agrees that this Mass is for the "Good of the Faithful" it can be celebrated as an external Solemnity.
357. The external solemnity of any feast belongs to it by the law itself, or is granted by a special indult.
358. The external solemnity belongs by law only:
(a) The Most Sacred Heart of Jesus;
(b) Our Lady of the Rosary, on the first Sunday of October;
etc.
it doesn't seem as though you can just wake up one morning and decide to have an external solemnity.
387. A votive Mass IV class is one which may be celebrated only on liturgical days IV class.
388. For a votive Mass IV class any Mass may be used which the rubrics allow to be said as a votive Mass. However, a just cause is required, such as the necessity, benefit or devotion of the priest celebrant or the faithful.
309. The following may be celebrated as votive Masses of our Lady:
(a) in the universal Church, Masses for our Lady on Saturday which are arranged in the Missal for the different seasons of the year, and also all Masses of feasts of our Lady which are inscribed in the universal calendar. (my emphasis)
LOL! This whole discussion is way above my pay grade.
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