Now largely a secular festival, Mardi Gras originated as a Christian celebration. The season runs between the Feast of Epiphany and Ash Wednesday in the spring, culminating in the revelry of Mardi Gras (French for "Fat Tuesday") which falls on February 21st this year. Mobile, Alabama, was the first U.S. locale to celebrate the festival in the early eighteenth century, when it was still a French colony. Celebrations include balls and parades featuring elaborate floats and costumes created by the city's Mystic societies.