Gaan-ngai is the biggest annual festival of the Rongmei who live in the three states of Assam, Manipur and Nagaland. The Gaan-ngai festival commences on 13th day of Manipuri lunar month Wakching and lasts for five days. Worship of God (Tingkao Ragwang) through prayer and sacrifice for bountiful harvest and future prosperity of the community, love and peace among mankind is the main theme of the festival. Living dead of the family are also honoured. The social and cultural values, the aesthetic and creative senses are also expressed in the festival. Communal feast is usually a part of the festival which is tantamount of oath taking. The data are based on available primary and secondary sources.