Magh Mela, which falls in the Hindu month of Magh, began on Jan. 5. While pilgrims can bathe in the water at any time during the 44-dayslong festival, the day known as "Mauni Amavasya" is considered the most auspicious and holy day to do so. The holiday, which fell on Jan. 20, is a celebration of a new moon according to the Hindu calendar.