A Kumbh Mela is a huge festival and pilgrimage in which Hindus gather by the million to bathe in the sacred rivers. They take place once every 12 years in each location with a half Kumbh Mela every 6 years. 2016 is such a year. There are 4 locations across India where the festivals are held. Haridwar, Allehebad, Ujjain and Nasik.