Question

it was a very big fair celebrated every 12 years at 4 holy places or Prayag ( Allahabad ), Haridwar, Ujjain and Nashik. it is helped by rotation on the banks of the sacred rivers - Godavari, Shipra, Yamuna and Ganga.

Answer 1

If you are asking about the name of the fair, it's "Kumbha Mela".