Dev Diwali, also known as Dev Deepavali, is a significant Hindu festival celebrating the victory of Lord Shiva over the demon Tripurasur. Celebrated on Kartik Purnima, this year it falls on November 15, 2024, and is especially grand in Varanasi, Uttar Pradesh. Learn about the significance, rituals, and why Varanasi is the heart of this luminous festival.