The NGT team is expected to visit the venue of the event this week to assess the damage caused to the area.
The three-day Art of Living World Culture Festival ended on Sunday, was held amid controversy that it caused ecological damage.
According to experts the flood plains serves as a natural groundwater recharge system and a flood barrier.
Before the beginning of the event, the AOL was asked to pay a fine of Rs 5 crores by the green court. It is speculated that NGT may increase the fine or environment compensation after assessing the damage.