As someone who has experience of booking tracks for events like that, they are already too late for this year, and someone somewhere down the line will have to stump up the best part of £10K to book something .......... thats before you bring in additional costs for food, cooking facilities, a bar, a license to sell booze ............
I love the idea and really dont want to piss on anyones chips, but getting the venue alone takes months of notice and a big deposit.