In the event of entrance of Jupiter in Aries circle and entrance of Sun and Moon in Capricorn Kumbh Festival is held at Prayag on the lunar conjunction day .
Kumbh Mela is a mass Hindu pilgrimage in which Hindus gather at the Ganges and river Yamuna, where bathing for purification from sin is considered especially efficacious.
The Ardh (half) Kumbh Mela is celebrated every six years at Haridwar and Allahabad, the Purna (complete) Kumbh takes place every twelve years, at four places Allahabad, Haridwar, Ujjain, and Nashik. The Maha (great) Kumbh Mela which comes after 12 'Purna Kumbh Melas', or 144 years, is held at Allahabad.
According to the Mela Administration's estimates, around 70 million people participated in the 45-day Ardh Kumbh Mela in Allahabad, in 2007.
In Hindu tradition Triveni Sangam is the "confluence" of three rivers. Sangama is the Sanskrit word for confluence. The point of confluence is a sacred place for Hindus. A bath here is said to wash away all of one's sins and free one from the cycle of rebirth