Saurabh
Seeing is believing. Visit https://www.google.co.in/maps/@28.5779141,77.2838038,487m/data=!3m1!1e3?hl=en, and view the venue from the eyes of a satellite. Google still has images from when construction had not begun.

You will see that the area has many trees. It is all green, a combination of trees, shrubs and perhaps even moss. Now find a contiguous 7 acre area within this territory. Sure, they left a tree standing in front of the stage. But could they construct a 40+ feet high, 7 acre stage without uprooting a single tree? Also, does fauna survive only on trees?

I will post some images from flashearth.com in the comments.