Year after year, people in Kolkata, Delhi, Mumbai and major cities wonder what exactly is Chhatt Puja when they witness so many lakhs and lakhs of men and women from Bihar out on the streets, heading towards the river or the sea. They see them push cartloads of bananas and other fruits or carry them on their heads, but few outsiders understand anything more. The main festival is just six days after Diwali, which explains why it goes by the colloquial name for the ‘sixth’, chhatt, that is also called Surya-shasthi.