Osun Osogbo festival is an annual event in Osogbo, Osun state, Nigeria where the river goddess of Osun is being worshipped. Tourists troop in from different parts of the world to witness and participate in the rites. The events takes place in August and its led by the Ata'Oja of Osogbo. Traditional rites are performed to cleanse the land and pray for fortunes in the new year. Quite an interesting event you should witness in a lifetime.