They saw God

Moses and Aaron, Nadab and Abihu, and the seventy elders of Israel went up and saw the God of Israel. Under his feet was something like a pavement made of lapis lazuli, as bright blue as the sky. But God did not raise his hand against these leaders of the Israelites; they saw God, and they ate and drank. - Exodus 24, NIV

Feast of Tabernacles

So all the assembly which had returned from the exile constructed temporary shelters and lived in them. The Israelites had not done so from the days of Joshua son of Nun until that day. Everyone experienced very great joy. - Nehemiah 8, NET

Passover

The king ordered all the people, “Observe the Passover of the LORD your God, as prescribed in this scroll of the covenant.” He issued this edict because a Passover like this had not been observed since the days of the judges; it was neglected for the entire period of the kings of Israel and Judah. But in the eighteenth year of King Josiah’s reign, such a Passover of the LORD was observed in Jerusalem. - 2 Kings 23, NET