a religious feast that does not occur on the same date each year.
The Day After Halloween Is Actually Called HallowmasHalloween is actually just the beginning of a string of otherworldly holidays. The tricks, treats, and customs of Halloween, now mostly secular, are based in part on an ancient Christian festival that spans November 1st and 2nd.
Origin of movable feast
Middle English word dating back to 1275–1325
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019