The main commonwealth stadium in New Delhi can easily host 150,000 people. By adding the IP indoor stadium and Vigyan Bhavan will take it up to 200,000.
Howdy Modi did 54,000 people way back in 2019. It is now completely feasible to do multi city events with 3D projection and virtual reality. And to broadcast the event to 250 million smartphones as is done by Jio for IPL Matches