When there is a liturgical office for the Day of Prayer for the Legal Protection of Unborn Children, you'll have a better leg to stand on.... If the Church needs to acknowledge the secular calendar, this can be done in some ways, but not in others.
In all the Dioceses of the United States of America, January 22 (or January 23, when January 22 falls on a Sunday) shall be observed as a particular day of prayer for the full restoration of the legal guarantee of the right to life and of penance for violations to the dignity of the human person committed through acts of abortion. The liturgical celebrations for this day may be the "Mass For Giving Thanks to God for the Gift of Human Life” (no. 48/1 of the Masses and Prayers for Various Needs and Occasions), celebrated with white vestments, or the Mass “For the Preservation of Peace and Justice” (no. 30 of the Masses and Prayers for Various Needs and Occasions), celebrated with violet vestments.” -- GIRM 373 (U.S.)
At such a Mass...
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