According to Hindu tradition, Lord Vamana laid his step at this 'sangam' while measuring the entire universe as a gift from the demon king Bali; an annual fair called 'Varuni Mela' is celebrated on every Vaman Dwadashi day (day of incarnation of Lord Vamana) as per Vikram calendar to commemorate that event, which coincides with the great festival 'Onam' of Kerala where king Bali is invoked. In Fatuha, Lord Vamana is invoked on this day with great number of rural people assembling at 'Triveni' to swim in the holy waters.