The production company that was filming at Windgather recently has just asked me to let people know that they will be working there again on the afternoon of Mon 20th. It will apparently be on a much smaller scale; they won't be occupying lots of parking spaces and they are fully aware that the public has a perfect right of access.
I have no connection to them other than I spoke to the production manager last time, and he's asked me to pass this on.