1 Kings 8:2

So Solomon celebrated the feast at that time, and all Israel with him, a great assembly from Lebo-hamath to the brook of Egypt, before Yahweh our God, for seven days and seven more days, even fourteen days.

And Jeroboam made a feast in the eighth month on the fifteenth day of the month, like the feast which is in Judah, and he went up to the altar; thus he did in Bethel, to sacrifice to the calves which he had made. And he had the priests of the high places, which he had made, stand in Bethel.

Then Solomon assembled the elders of Israel and all the heads of the tribes, the leaders of the fathers’ households of the sons of Israel to Jerusalem, to bring up the ark of the covenant of Yahweh from the city of David, which is Zion.

And all the men of Israel assembled themselves to the king at the feast, that is in the seventh month.