movable feast(n = noun.time) moveable feast - a religious holiday that falls on different dates in different years;
is a kind of feast day, fete day
has particulars: easter, feast of the unleavened bread, passover, pesach, pesah

feast, feast day, feast of booths, feast of dedication, feast of dormition, feast of lights, feast of sacrifice, feast of tabernacles, feast of the circumcision, feast of the dedication, feast of the unleavened bread, feast of weeks, feast one's eyes, love feast, movable, movable barrier, moveable feast