Festival of Lights Many deem it as the day on which Lord Rama and Sita returned to Ayodhya after exile. On that dark Amaavasya night, people of that holy town lighted oil lamps for the guidance of the divine couple, a tradition followed till today. A Yuga later, it was the turn of Lord Krishna to make an auspicious occasion when he destroyed the dreaded demon-king Narakasura and freed princesses and people alike from his evil clutches. https://www.boloji.com/articles/50563/festival-of-lights