I do know of one but not them all i know of Passover
The plural of feast is feasts.
feast
Is feast plural
why did they have a feast? what were they celebrating?
Feast can be a noun and a verb. As a noun: We enjoyed a lovely Thanksgiving feast. As a verb: Feast your eyes on that turkey!
The noun 'feast' is a standard collective noun for 'a feast of brewers'.
The feast of the Annunciation.
Feast of Tabernacles
feast = se'udá (סעודה)
A large feast is a banquet.
The Feast of Unleavened Bread The Occasion of our Freedom
Feast of the Assumption of the Blessed Virgin Mary - this is a major feast day