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According to Vine ekklhsia is used in the Septuagint to designate the "gathering" of Israel, summoned for any definite purpose, or a "gathering" regarded as a representative of the whole nation.

The explicit corollary in Hebrew to 'church' would be: מוער אחל

However, the connotations are entirely different, i.e., The word church is an English-language word translated from the original Greek ekklesia which means "called-out-ones". Old Testament Israel was usually called by the term "congregation." In some respects the word congregation is synonymous with the word church. Yet there is a distinct difference between the terms church and congregation. The congregation of Israel was separate, as a separate nation. But they were not called-out-ones spiritually in the same sense that characterizes the New Testament Church.

Seven annual festivals were given to Old Testament Israel and were ordained forever. Their true meaning had long remained a hidden mystery. They picture God's plan of redemption--the divine plan by which God is reproducing himself. The Passover pictures the death of Christ in payment for the penalty of human sin repented of. The seven days of the Festival of Unleavened Bread picture the Church coming out of sin, even as Israel came out of Egypt. The Day of Pentecost, originally called Feast of Firstfruits, pictures the Church as the first to be begotten and born as children of God during the Church age. The Feast of Trumpets pictures the Second Coming of Christ to take over earth's throne and to rule all nations. The Day of Atonement pictures the putting away of Satan. The Feast of Tabernacles pictures the thousand-year reign under the rule of Christ and the born children of God. The Final Great Day pictured the final judgment.

The congregation of Israel was separate, as a separate nation. But they were not called-out-ones spiritually in the same sense that characterizes the New Testament Church.

How do you know that ?
Do you know the mind of YHvH ?
I think not !
Pentecost is not the feast of First Fruits.
Yom HaBikkurim is beginning of the counting of the Omer,
where the finest is offered to YHvH.
It occurs on the day following the Shabbat following Pesach.
OBTW you missed the Feast of Hag HaMatzot where all the leaven(sin) is removed.
Strong's H6950 - qahal
קָהַל
Transliteration
qahal
Pronunciation
'kä·hal' (Key)
Part of Speech
verb

Root Word (Etymology)
A primitive root
TWOT Reference
1991
Outline of Biblical Usage
1) to assemble, gather
a) (Niphal) to assemble
1) for religious reasons
2) for political reasons
b) (Hiphil) to summon an assembly
1) for war, judgment
2) for religious purposes

shalom b'SHEM Yah'shua HaMashiach