Here is a very good articles explaining the economic benefits due to Kumbh Mela:
Confederation of Indian Industry (CII), the apex trade body, expects the 2019 Kumbh Mela to generate business worth ₹1,20,000 crores. While the government expenditure on the festival is ₹4,200 crore.
The CII also says that the festival will create 600,000 jobs. In hospitality alone 250,000 people will receive work through the festival and hundreds of thousands more in tour operations and airlines, local transport and logistics, as formal and informal guides, and in emergency and ancillary support systems. Around 85,000 jobs will come from medical tourism and eco-tourism related to the festival alone.
But this is not new. In 2013, when the Kumbh Mela was last held, it created an estimated 100,000 jobs directly in the arrangements of the festival and an equal amount in the wider economy. Local authorities estimated that the impact of the Kumbh Mela is about 15 to 20 times the amount of money spent organising it.
In 2013, the local administration had raked in $2.2 billion on an investment of around $220 million.
