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).
First Saturday votive: (White) Mass of August 22, Gloria, commemoration of the saint, no Credo, preface of the BVM with Et te in veneratione.
Mass of the feast, Gloria, proper Collect, no Credo, preface of the Ascension
Ordinary Office of the feast
Matins: Invitatorium and Hymn from the Common; psalms and antiphons of the feria; first two lessons of the occurring Scripture (second and third joined); lesson 3 of the feast; oration proper; Te Deum
Lauds: Antiphons and psalms of the feria (first schema), remainder from the Common; oration proper
Hours: Antiphons and psalms of the feria, remainder from the Common; oration proper
I Vespers: Of Dominica after Ascension; Antiphon Alleluia and psalms of Saturday; remainder proper
Compline: Of Saturday