Camping at the bank of river Ganges at Sangam during Kumbh is known as Kalpawas (कल्पवास). Sand of Sangam is considered pious for Kalpawas.
People follow austerity during this period and have only single meal in the day, wear white clothes and abstain from all sort of worldly pleasures for a month. The main activities during Kalpawas are
1. Tap (तप )
2. Homa (होम )
3. Dana (दान)
Most devotees do Kalpawas from Paush Purnima to Magh Purnima which spans for one complete lunar month. However few devotees do Kalpawas from Makar Sankranti to Kumbh Sankranti. Usually Maithil Brahmin from Bihar and Jharkhand do Kalpawas for one complete solar month.
Most Naga Sadhus camp at Sangam during this period.