If you really want a MAD weekend you can't go far wrong attending a Tresaith Open (See link below) Theres a beautiful beach, 1 shop, 1 pub and 1 campsite but usually they erect a marquee on the beach for their bigger events. I think that the logistics would be a problem for some but those who made the effort would not be disappionted. It's also their 20th Annversary next year. Hurricanes and GP14's have held succesful TT's there.
http://www.tresaithmarinerssc.co.uk/tresaith/index.htm