The Kumbh Mela is a Hindu religious festival that takes place in India at four different locations on a rotational basis: Allahabad, Haridwar, Nashik, and Ujjain. It is held every 3 years at each of these locations, with the location for the next Kumbh Mela determined by the position of the planet Jupiter. The last Kumbh Mela took place in Haridwar in April 2021, so the next one is expected to take place in Ujjain in April 2024. It is important to note that the dates for the Kumbh Mela are determined according to the Hindu calendar and may vary from year to year.