Cancelling a series of music festivals would be a "devastating blow" that leaves tens of thousands of people "in limbo", the Night Time Industries Association (NTIA) has warned.
A series of events, including the Mighty Hoopla, Cross The Tracks and Wide Awake, are due to be held at Brockwell Park in south London from 23 May until 8 June.
But on Friday, resident Rebekah Shaman won a High Court challenge over the use of the site this summer, after arguing that the council did not have the correct planning permission for the events.
A Lambeth Council spokesperson said: "We are currently assessing the impact of this judgment and determining next steps."