Thats the boyracers weekly summer meet. Originally set up by the now departed 'cruisenotts' its still attended by many local clubs. Mostly ex and currant cruisers though. You wont find the local cowboys attending, or the nissan micra club.
Its owned by somebody from shwaddywaddy. He opens it for about 6 months of the year. Its for bikers most other nights its open.
MFN=middle of fucking nowhere. A name he had to change.
Wait till a bit later, and a lot of cars will precession off to a slightly less legal venue for afters. If you like that sort of thing...