Observance in a liturgical calendar with no fixed calendar date
A moveable feast is an observance in a Christian liturgical calendar which occurs on different dates in different years.[1]
- ^ John Ayto Oxford Dictionary of English Idioms (2010), p. 123. 019954378X: "a movable feast an event which takes place at no regular time. In a religious context a movable feast is a feast day (especially Easter Day and the other Christian holy days whose dates are related to it) which does not occur on the same calendar date each year."