Kumbh Mela can be found in the accounts of Chinese monk Xuanzang during his India visit in 629–645 CE.
According to medieval Hindu theology, its origin is found in one of the most popular medieval puranas, the Bhagavata Purana
By the approach It comes from the Devas had lost their strength by the curse of Durvasa Muni, and to regain it, they approached Lord Brahma and Lord Shiva.
They directed all the demigods to Lord Vishnu and after praying to Lord Vishnu, he instructed them to churn the ocean of milk Ksheera Sagara (primordial ocean of milk) to receive amrita (the nectar of immortality). This required them to make a temporary agreement with their arch enemies, the Asuras, to work together with a promise of sharing the wealth equally thereafter.
However, when the Kumbha (urn) containing the amrita appeared, a fight ensued. For twelve days and twelve nights (equivalent to twelve human years) the Devas and Asuras fought in the sky for the pot of amrita.
It is believed that during the battle, Lord Vishnu (incarnated as Mohini-Mürti) flew away with the Kumbha of elixir spilling drops of amrita at four places: Allahabad (Prayag), Haridwar, Ujjain and Nashik.
Hindus gather to bathe in a sacred river
This place is marked as faith of Hindu pilgrimage
Considered to be the largest peaceful gathering in the world where around 100 million people were expected to visit during the Maha Kumbh Mela in 2013 in Allahabad
Held at one of the places from Haridwar, Allahabad,Nashik, Ujjain.
Rivers at these four places are: the Ganges (Ganga) at Haridwar, the confluence (Sangam) of the Ganges and the Yamuna and the mythical Saraswati at Allahabad, the Godawari at Nashik, and the Shipra at Ujjain.
Kumbha means a pitcher and Mela means fair in Sanskrit it comes from Hindi
The festival is billed as the “world’s largest congregation of religious pilgrims”.
There is no precise method of ascertaining the number of pilgrims, and the estimates of the number of pilgrims bathing on the most auspicious day may vary; approximately 80 million people attended on 14 February 2013.