2 Chronicles 5:3

So all the men of Israel came together to the king at the feast in the seventh month.

Note That is, the Feast of Tabernacles (or Booths or Shelters); see Leviticus 23:33–36.

BSB · Berean Standard Bible
Wherefore all the men of Israel assembled themselves unto the king in the feast which was in the seventh month.
KJV · King James Version
So all the men of Israel assembled themselves to the king at the feast, which was in the seventh month.
WEB · World English Bible
And all the men of Israel assembled themselves unto the king at the feast, which was in the seventh month.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

Wherefore
1 Kings 8:2
in the feast
That is, as the Targumist observes, in the feast of tabernacles, which was held in the seventh month of the ecclesiastical year, which was called Ethanim.
2 Chronicles 7:8–10; Leviticus 23:34–36; 1 Kings 8:2