The most widely celebrated festival in Bihar is Chhath Puja. It is a four-day Hindu festival dedicated to the Sun god, Surya. The festival is observed in the month of Kartik (October-November) and marks the end of the harvest season.
Chhath Puja is a major tourist attraction in Bihar. The festival is celebrated with great pomp and show. People from all walks of life participate in the festivities. The main attraction of the festival is the ritual of offering prayers to the Sun god while standing in the river.
The other three festivals mentioned in the question are also important festivals in Bihar, but they are not as widely celebrated as Chhath Puja. Diwali is a five-day Hindu festival of lights. It is celebrated in the month of Kartik (October-November) and marks the victory of good over evil. Holi is a two-day Hindu festival of colors. It is celebrated in the month of Phalgun (February-March) and marks the beginning of spring. Teej is a two-day Hindu festival of love and fertility. It is celebrated in the month of Shravan (July-August) and marks the beginning of monsoon.
Chhath Puja is a unique and beautiful festival that is celebrated with great devotion and fervor in Bihar. It is a time for family and friends to come together and celebrate the blessings of the Sun god.