Guru Nanak was the founder of Sikhism religion and the first of the ten Sikh Gurus.
His practices where
Vaṇḍ Chakkō: Sharing with others, helping those with less who are in need Kirat Karō: Earning/making a living honestly, without exploitation or fraud Naam Japna: Meditating on God’s name to control the five weaknesses of the human personality.
People of Gokuldham worshiped Govardhan Mountain. Indra was angered upon seeing the villagers’ devotion diverted away from him and toward Krishna. Indra decided to initiate thunderstorms and heavy rains in the city in reflex of his egoistic anger. To protect the people from the storms,
Krishna lifted the Govardhan Mountain with his little finger and provided shelter to all the people and cattle of the city. After 7–8 days of continuous storms,seeing the people of Gokul being unaffected, Indra accepted defeat and stopped the storms.
This is the occasion when we pray to the Govardhan mountain.