Khanna, Tarun, John Macomber, and Saloni Chaturvedi. "Kumbh Mela: India's Pop-up Mega-City." Harvard Business School Case 214-023, August 2013. (Revised January 2019.) ...

According to the United Nations criteria of urban agglomerations, a mega city has a population of 10 million or more. In India, six cities meet this criterion — Delhi, Mumbai, Bengaluru ...