Days on which the reading from the lectionary must be used during a Catholic wedding

If your wedding is on a Sunday, certain feast days, or a holy day of obligation, you must use the readings the Lectionary for Mass provides for that day. The readings provided by the Lectionary for Mass must be used from Holy Thursday through Easter, and on the feast days of Christmas, Epiphany, Ascension, Pentecost, and Corpus Christi (Rite of Marriage 11). In addition, the readings provided by the Lectionary for Mass must also be used on holy days of obligation. The holy days of obligation in the United States are: January 1, the solemnity of Mary, Mother of God; Thursday of the sixth week of Easter, the feast of the Ascension; August 15, the solemnity of the Assumption of the Blessed Virgin Mary; November 1, the feast of All Saints; December 8, the feast of the Immaculate Conception; and December 25, Christmas (from the USCCB Committee on the Liturgy).