The New Indian Express. As the cold winter sets in and the echoes of Deepavali celebrations fade away, Biharis living in Hyderabad have begun to get into the festive spirit and prepare for Chhath Puja. Hyderabad: Hyderabad is gearing up for Chhath Puja, the revered four-day festival dedicated to the Sun God, to be celebrated from October 25 to 28. Thousands of devotees, mainly from Bihar,.