OK, on another forum I used to frequent, I organised a meet at Donington Park. It is very central, and for those coming a long way, there are Travelodges and the like nearby.
The reason for Donington - providing it isn't a major motorsport event, then its massive car parks are deserted, there is the Grand Prix collection, there is often testing (weekdays) or minor motorsports (weekends), and if you know where to go, there is still the massive pre-war "donington loop" to have a play on. So basically, you can all stand around in the car park, eyeing up each others cars and talking nerdy stuff, or if you get bored, then have a mooch around the museum (which really is well worth seeing), or even go for a cruise into Nottingham, Derby or Leicester.
Oh, and there are some cracking B roads nearby too!

Matlock is also another good area, but you need to avoid the bikes, which can often take over!
The Heritage Motor Center at Gaydon is also another good place, and central too.
There, some of my suggestions.
