Allahabad among four host cities: how the Kumbh Mela rotates, in UNESCO's own entry

Background

UNESCO's entry for the Kumbh Mela, an element of India inscribed in 2017, names Allahabad, Haridwar, Ujjain and Nasik as the cities where the festival is held.
Allahabad is in Uttar Pradesh, Haridwar in Uttarakhand, Ujjain in Madhya Pradesh and Nasik in Maharashtra, so the festival moves across four States.
UNESCO calls it the largest peaceful congregation of pilgrims on earth.
Bathing in the Ganges is the act at the centre of the observance.
The element was inscribed at the twelfth session of the Intergovernmental Committee, recorded as 12.COM.