35. Christmas has its own octave, arranged as follows:
a. Sunday within the octave is the feast of the Holy Family;
b. 26 December is the feast of Saint Stephen, First Martyr;
c. 27 December is the feast of Saint John, Apostle and Evangelist;
d. 28 December is the feast of the Holy Innocents;
e. 29, 30, and 31 December are days within the octave;
f. 1 January, the octave day of Christmas, is the solemnity of Mary, Mother of God. It also recalls the conferral of the holy Name of Jesus.
But looking at the table of liturgical days, days within the Octave are just that and not solemnities.355. On Optional Memorials,
a) On the weekdays of Advent from December 17 to December 24, on days within the Octave of the Nativity of the Lord, and on the weekdays of Lent, except Ash Wednesday and during Holy Week, the Mass texts for the current liturgical day are used; but the Collect may be taken from a Memorial which happens to be inscribed in the General Calendar for that day, except on Ash Wednesday and during Holy Week. On weekdays of Easter Time, Memorials of Saints may rightly be celebrated in full.
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