The Kumbh Fair is organized to commemorate the legend of the struggle between the Gods and Demons over the Amrita Kumbha that is Pot of Nectar of Immortality. It is believed that during the battle, Lord Vishnu flew away with the pot of nectar and the drops from which spilled over Allahabad (Prayag), Haridwar, Ujjain and Nashik. Therefore, the festival is celebrated.

It is celebrated in Phalgun and Chaitra month, that is the month of February, March or April. The Maha Kumbh Fair is the largest religious gathering that takes place every twelve years at four religious sites Allahabad, Haridwar, Nasik and Ujjain and the Ardh Kumbh Fair is celebrated every six years at Haridwar and Allahabad. The normal Kumbh fair takes place every three years.

During the Kumbh Mela people come to wash away their sins and to purify their soul by taking a holy dip in the spiritual water of these rivers. It is believed that during this time the rivers convert into purifying nectar which allows the devotees to cleanse their souls when they bath.