A mock-religious festival popular during the Middle Ages in Europe, particularly France, the Feast of Fools had much in common with the Roman Saturnalia. Various classes of the clergy took turns reversing the normal procedures in the church—the group to whom the day belonged would nominate a bishop and archbishop of fools, ordaining them in a mock ceremony and then presenting them to the people. They would dance and sing obscene songs, play dice or eat at the altar, burn old shoes in the censers, and engage in other activities that would normally be unthinkable. Discuss
Source: The Free Dictionary