movable feast

Noun

 * 1) A day of note, frequently a Christian festival, whose date changes from year to year according to a set of rules.

Translations

 * Dutch: roerende feestdag
 * Finnish: liikkuva juhla
 * German: beweglicher Feiertag
 * Polish:
 * Russian: переходящий пра́здник, подви́жный пра́здник
 * Spanish: fiesta movible