371. Among Masses of this kind are included Ritual Masses, Masses for Various Needs and Occasions, and Votive Masses.
When they can’t and can be celebrated:
372. Ritual Masses are connected to the celebration of certain Sacraments or Sacramentals. They are prohibited on Sundays of Advent, Lent, and Easter, on Solemnities, on the days within the Octave of Easter, on the Commemoration of All the Faithful Departed (All Souls’ Day), on Ash Wednesday, and during Holy Week, and furthermore due regard is to be had for the norms set out in the ritual books or in the Masses themselves.
373. Masses for Various Needs and Occasions are used in certain situations either as occasion arises or at fixed times.
What a diocesan bishop should determine:
Days or periods of prayer for the fruits of the earth, prayer for human rights and equality, prayer for world justice and peace, and penitential observances outside Lent are to be observed in the Dioceses of the United States of America at times to be designated by the Diocesan Bishop.
On January 22nd:
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.
And for something more serious, still, a respect for the traditions of the liturgical year should be respected:
374. If any case of a graver need or of pastoral advantage should arise, at the direction of the Diocesan Bishop or with his permission, an appropriate Mass may be celebrated on any day except Solemnities, the Sundays of Advent, Lent, and Easter, days within the Octave of Easter, the Commemoration of All the Faithful Departed (All Souls’ Day), Ash Wednesday, and the days of Holy Week.