Original sentence: Among them, the pilgrimage in the month of Āshādh (June-July) in the Hindu Shāliwāhan Shak calendar attracts the largest number of pilgrims --around 0.5 to 0.7 million people
Edited sentence: Among them, the pilgrimage in the month of Āshādh (June-July) in the Hindu calendar attracts the largest number of pilgrims --around 0.5 to 0.7 million people