Holy Saturday
Color: Violet then White
Penance: Fast & Complete Abstinence through Noon (or the end of the Easter Vigil Mass)
Flowers: Yes, but only from the start of the Mass onward
Organ: Yes, only from the Gloria in excelsis at Mass onward
Penitential kneeling: Yes, until the Mass begins
Mass
After None, Blessing of the New Fire, Exsultet, Lessons, Blessing of the Baptismal Water, Litany of the Saints. After the Litany, Mass (in white) of the Easter Vigil, no Commemorations, no candles carried at the Gospel. After Communion, short First Vespers of Easter, no Commemorations. Double Alleluia at the dismissal.. Folded Chasubles: Yes, for the Vigil but not the Mass
Gloria. No Credo.
Preface: Easter ("hac potissimum nocte")
Proper Communicantes/Hanc Igitur: Proper Communicantes and Hanc Igitur for Easter
Office
Matins: Tenebrae on the evening of Good Friday
Lauds: Proper Office of the Sacred Triduum
Prime: Proper Office of the Sacred Triduum
Day hours: Proper Office of the Sacred Triduum
Vespers: Special, short form of First Vespers of Easter after the Communion of the Vigil Mass, no Commemorations. After today, Vespers return to their normal time on all days.
Compline: Proper Compline for Holy Saturday. From now through None of Ember Saturday of Pentecost, the final Marian antiphon = "Regina Coeli", which is always sung standing.