potlatch, n. [Chinook potlatch, pahtlatch, fr. Nootka pahchilt, pachalt, a gift.].
Among the Kwakiutl, Chimmesyan, and other Indians of the northwestern coast of North America, a ceremonial distribution by a man of gifts to his own and neighboring tribesmen, often, formerly, to his own impoverishment. Feasting, dancing, and public ceremonies accompany it. [Webster 1913 Suppl.]
Hence, a feast given to a large number of persons, often accompanied by gifts. [Webster 1913 Suppl.]