Why do some Himachal villages celebrate 'Budhi Diwali' a month after Diwali?

'Budhi Diwali' is a traditional festival celebrated in parts of Himachal Pradesh, particularly in Kullu, Sirmaur and Shimla, about a month after Diwali. It is believed that news of Lord Ram's return to Ayodhya reached these remote snow-covered villages late. The celebrations feature torch processions, folk dances, music and traditional rituals.