'Festival' in the Bible

So all the men gathered together to meet with King Solomon at the Festival of Tents in the month Ethanim, the seventh month.

So Solomon observed the Festival of Tents at that time, as did all of Israel with him. A large assembly came up from as far away as Lebo-hamath and the Wadi of Egypt to appear in the presence of the LORD our God, not just for seven days, but for seven days after that, a total of fourteen days.

Jeroboam invented a festival for the fifteenth day of the eighth month similar to the festival that takes place in Judah. He approached the altar that he had set up in Bethel and sacrificed to the calves that he had made, having stationed in Bethel the priests that he had appointed.

Then, on the fifteenth day of the eighth month, he went up to burn incense on the altar that he had set up in Bethel, thus beginning the festival that he had made up out of his own heart for the Israelis.