The Maha Kumbh Mela comes once in 12 years to four different locations in India: Haridwar, Allahabad (Prayagraj), Ujjain, and Nashik. According to the legends, it is the time when the nectar of immortality was spilled while fighting between gods and demons. https://book-cab.stck.me/post/647702/Top-10-Things-to-Know-Before-Attending-the-Maha-Kumbh-Mela