There was one in Peterborough a few weeks ago that is apparently an annual affair, but it's so badly advertised you could be excused for never knowing it existed. Heck, I didn't end up going because 5 days before I still couldn't even confirm if it was on for 2015 and I ended up making other plans.
They adveristed in a grand total of 2 places - a bikers magazine, and a blurb on their Facebook page about it only days beforehand. A page that before that hadn't received a post for several years.