Not good to tell GT we have an organised event with organised activities. They'll insist on Insurance, H&S studies etc. Just do stuff adhoc and informal.
DaveDH and I had a daft idea a few years ago involving time trialing down spooky on kids bikes. I asked GT if we could, they got all serious and basically said no unless we could get all the insurance, sponsorship, first aid etc put in place.
Also might not get away with a Marqee in freeride car park, wardens etc might cause trouble :roll: