A Catholic moveable feast is a religious holiday that takes place on a different date each year. The term "movable feast" is used to describe a Christian liturgical calendar observance that is not held on the same day every year. So, just what you'd thought!
Announcement of the 2025 Liturgical Moveable Feasts:
On the Epiphany of the Lord, after the Gospel, a Deacon or cantor, in keeping with an ancient practice of Holy Church, announces from the ambo the moveable feasts of the current year according to this formula: Know, dear Parishioners that, as we have rejoiced at the Nativity of our Lord Jesus Christ, so by leave of God’s mercy we announce to you also the joy of his Resurrection, who is our Savior.
-On the 5th day of March will fall Ash Wednesday, and the beginning of the fast of the most sacred Lenten season.
-On the 20th day of April you will celebrate with joy Easter Day, the Paschal feast of our Lord Jesus Christ.
-On the 29th day of May will be the Ascension of our Lord Jesus Christ.
-On the 8th day of June, the feast of Pentecost.
-On the 22nd day of June, the feast of the Most Holy Body and Blood of Christ.
-On the 30th day of November, the First Sunday of the Advent of our Lord Jesus Christ, to whom is honor and glory for ever and ever.