From H2287 (to hold a feast, to reel), chag refers to a festival or feast, often involving a pilgrimage. It signifies a time of communal celebration, worship, and remembrance of God's saving acts.
The chag was a cornerstone of Israel's corporate worship and national identity. God commanded Israel to observe three great pilgrimage feasts: the Feast of Unleavened Bread (Passover), the Feast of Weeks (Pentecost), and the Feast of Booths (Tabernacles). These were not mere parties, but divinely appointed times to remember God's deliverance, provision, and covenant faithfulness. They were expressions of joy and gratitude, and they served to unify the nation in their worship of Yahweh. The feasts often prefigured the work of Christ.