The recent Decree of the CDF permitted the optional observance in the Old Roman Rite of Saints canonised since 1960.
But nobody, of course, will want to observe all the several hundreds of them! Journalists often do not understand that when a man or woman is added to the Catalogus Sanctorum, this does not mean that they are observed on their feast day in every Catholic Church in the world. Not even in every Latin Catholic Church in the world! And even if they do achieve the status of being in the (Novus Ordo) Calendarium Romanum Generale, this stiill does not mean that they have compulsory observations . They may be (mere!) ad libitum memoriae.
So I have tried to collect those post 1960 canonisations which are in the General Roman Calendar as Saints who are to be observed obligatorily in the Novus Ordo. One might say that these have settled down into the piety of the faithful, and enjoy the full confidence of the Latin Church.
So how many hundreds does that reduce the applicants to? Well, it reduces the pressing crowds to just five commemorations (three of which, however, commemorate groups of Martyrs). And two of these five, square bracketed on the list beneath, fail at the last hurdle to make the cut.
So then there were three.
They are these:
IUNIUS 3 S Caroli Lwanga et Sociorum Martyrum.
[AUGUSTUS 14 S Maximiliani Mariae Kolbe Martyris; but he will be kept out in the ccold by the II Class Vigil of the Assmption.]
SEPTEMBER 20 Ss Andreae Kim et Sociorum Martyrum.
23 S Pii de Pietrelcina Confessoris.
[NOVEMBER 24 Ss Andreae Dung-Lac et Sociorum Martyrum collides with S John of the Cross.]
So, if one desires, one can observe these three de facto as Class III Saints, using the Commons in the Missal and Breviary.
Please let me know if I've made mistakes or forgotten somebody ... I probably have.
If anyone wants a list of Commemorations which are optional in the Novus Ordo, let me know. I think it might amount to 12-15, including those post-Conciliar popes, Mother Theresa ...
And remember that there are also people like S Louis Grignion de Montfort, who were canonised well before 1960, but who only made the transition from pro aliquibus locis to the Calendarium Romanum Generale after that date.