This festival is in commemoration of the lifting of Mount Govardhan by Krishna. According to a legend, before Krishna was born, Indra, the god of Rain, was the chief deity of Vraj. Then Krishna instigated the people to stop worshipping Indra. Indra wanted to show his power over Krishna and brought about a cloud-burst which flooded the countryside for many days. People were afraid that the downpor was a result of their neglect of Indra. But Krishna assured them that no harm would befall them. He lifted Mount Govardhan with his little finger and sheltered men and beasts from the rain. This gave him the epithet Govardhandhari. After this, Indra accepted the supremacy of Krishna. (Shakti M Gupta. 1991. Festivals, Fairs and Fasts of India. Pages 145-146.)
Yours,