keep the feast

Boyd’s Bible Dictionary:

(joyful). Observed for joyous events (Gen. 21:8; 29:22; 40:208And the child grew, and was weaned: and Abraham made a great feast the same day that Isaac was weaned. (Genesis 21:8)
22And Laban gathered together all the men of the place, and made a feast. (Genesis 29:22)
20And it came to pass the third day, which was Pharaoh's birthday, that he made a feast unto all his servants: and he lifted up the head of the chief butler and of the chief baker among his servants. (Genesis 40:20); Mark 6:21-2221And when a convenient day was come, that Herod on his birthday made a supper to his lords, high captains, and chief estates of Galilee; 22And when the daughter of the said Herodias came in, and danced, and pleased Herod and them that sat with him, the king said unto the damsel, Ask of me whatsoever thou wilt, and I will give it thee. (Mark 6:21‑22)). Numerous religious feasts (Ex. 12:1616And in the first day there shall be an holy convocation, and in the seventh day there shall be an holy convocation to you; no manner of work shall be done in them, save that which every man must eat, that only may be done of you. (Exodus 12:16); Lev. 23:21-2421And ye shall proclaim on the selfsame day, that it may be an holy convocation unto you: ye shall do no servile work therein: it shall be a statute for ever in all your dwellings throughout your generations. 22And when ye reap the harvest of your land, thou shalt not make clean riddance of the corners of thy field when thou reapest, neither shalt thou gather any gleaning of thy harvest: thou shalt leave them unto the poor, and to the stranger: I am the Lord your God. 23And the Lord spake unto Moses, saying, 24Speak unto the children of Israel, saying, In the seventh month, in the first day of the month, shall ye have a sabbath, a memorial of blowing of trumpets, an holy convocation. (Leviticus 23:21‑24); Jude 1212These are spots in your feasts of charity, when they feast with you, feeding themselves without fear: clouds they are without water, carried about of winds; trees whose fruit withereth, without fruit, twice dead, plucked up by the roots; (Jude 12)).

Strong’s Dictionary of Greek Words:

Number:
1858 (find all occurrences in KJV Bible)
Greek:
ἑορτάζω
Transliteration:
heortazo
Phonic:
heh-or-tad’-zo
Meaning:
from 1859; to observe a festival
KJV Usage:
keep the feast