Govardhan Puja is observed on the fourth day during 5-day Diwali festival. In 2017, Govardhan Puja date is October 20. It is mainly observed in North Indian states of Uttar Pradesh, Bihar, Haryana, Jharkhand and Chhattisgarh.
On this day, Lord Sri Krishna along with cows is worshipped. Govardhana Pooja is celebrated as a commemoration of the lifting of Govardhanagiri by Lord Sri Krishna. Thus, Krishna acquired the name of ‘Govardhanagiri Dhari or ‘Govardhandhari.
Legend of Govardhan Puja:
The legend or the story of Govardhan is mentioned in many sacred scriptures. According to the Vishnu Purana, a severe drought affected Gokul when Sri Krishna was young kid. People of Gokul had set up everything to do Indra Puja and sacrifices to please Indra, who is considered as the Lord of rain and nature as per Hinduism.
But, little Krishna stopped the people who were worshipping Indra and suggested them to perform Gopooja (Gomata pooja) instead of Indra Puja. This made Indra furious and poured in heavy rain on Gokul. The people of Gokul and cattle were feared and prayed to Krishna to save them from the dangerous flood.
Young Krishna lifted the Mount Govardhan and invited people and cattle of Gokul to reside under it. Indra knew his mistake and appeared before Krishna and asked him to forgive.