Description : The Gammaduwa, also known as Devol Madu Shanthikarmaya, is a profound traditional Sri Lankan ritual and blessing ceremony, predominantly practiced in the southern low-country to invoke the blessings of the goddess Pattini. It is a collective act of worship—a "hall in the village"—designed to ensure prosperity, good health, and a plentiful harvest while protecting the community from plagues and evil forces. Sri Lanka.