Gopashtami is one of the most important and cheerful pastimes among all the pastimes of lord Shri Krishna. The eighth lunar day of Kartik month is known as Gopashtami. It is believed that on this auspicious day Nanda Maharaj send his children Krishna and Balrama for the first time to herd the cows. Krishna now stepped into the age of kumara from pauganda. Till the age of pauganda, Krishna was a calf keeper. After stepping into the age of Kaumara, on the auspicious day of Gopastami lord Shri Krishna started to herd the cows. To witness this incident Shri Radharani took the form of his Sakha.
