The rituals of the festival are rigorous
and are observed over a period of four days. They include holy bathing, fasting
and abstaining from drinking water , standing in water for long periods of
time, and offering prashad and aragh to
the setting and rising sun.
Although it is observed most
elaborately in Bihar, Jharkhand, Eastern UP and the Terai regions of Nepal in
modern times, and is more prevalent in areas where migrants from those areas
have a presence, it is celebrated in all regions and major urban centers in
India and nepal. On this day rani pokhari is decorated well in Kathmandu too.The
festival is celebrated in the regions including but not exclusive to the
northeast region of India, Madhya Pradesh, Uttar Pradesh, Chhattisgarh,
Chandigarh, Gujarat,Delhi, Mumbai and Mauritius.