It is my firm belief that the lack of ATC is because they are simply unable to cope and have thrown their hands up to let the pilots get on with it.
It is my firm belief that lack of ATC saves rather a lot of money - even
if you were to find the ATCOs willing to give up their time to do such a thing you would still have to cover their costs and the astronomical CAA charges. You would still be unlikely to get a signifficantly safer service than that provided by the Sywell FISOs.
The special procedures for the event mitigate some of the risks and are probably tweaked each time, but 100s of aircraft converging on an airfield involves some risk. You just have to balance the risk against the the pleasure of flying to an airfield with 100s of aircraft there. If the risk feels too great then don't go.