A Sadhu plays flute using the bull horn. This event is a religious fasting observed by followers of Hinduism, particularly in the Bengali tradition. It is dedicated to the worship of the goddess Kartik, also known as Karthik Thakur. Devotees observe a day-long fast and engage in prayers and rituals to seek the blessings of the deity. The fasting usually takes place on the eleventh day of the Bengali month of Kartik.