The First Saturday votive Mass may be said: “one Mass of the Immaculate Heart of the Blessed Virgin Mary, on the first Saturday of each month, in churches and oratories in which special devotions are held on that day in honor of the Immaculate Heart of Mary” (Rubricæ generales, 385c).
IV class Votive Masses are permitted, but IV class Requiem Masses are not (until January 13 inclusive).
First Saturday votive: (White) Mass of August 22, Gloria, no Credo, preface of the BVM with Et te in veneratione.
Mass of the B.V.M. on Saturday (White), Gloria, no Credo, preface of the B.V.M. with Et te in veneratione
Matins: Invitatorium and Hymn from BVM on Saturday; first two lessons from occurring scripture, proper to January 4 (second and third joined); third lesson of BVM on Saturday, mense ianuario, Te Deum
Lauds: Antiphons and psalms of the feria (first schema); remainder of BVM on Saturday
Hours: Antiphons and psalms of the feria; remainder of BVM on Saturday; in Prime responsory Qui natus es
I Vespers: Of the Holy Name: proper antiphons, Sunday psalms except Ps. 115 (Credidi) for fifth psalm, remainder proper
Compline: Of Sunday