I know it's a little far in advance but this event fills up pretty quickly as it's quite popular.
You can book your place from 1st April at
www.exmoorexplorer.com.
It a 25 or 35 mile route across Exmoor. There's usually some very good stuff there and some killer climbs (if that's you kind of thing). I've ridden all but one of the events now.
There is camping at the start (or other accommodation in nearby places like Minehead or Williton) together with a nearby pub and 'Pasta party'. Entry is normally £20 and slightly cheaper for the ladies.
Would be good to do it as a group if a few are up for it. Nearby is the Quantocks (Triscombe plus load of other XC/DH runs) and it's only 2 hours to places like Afan if you want to make a weekend of it.
Video of last year (v. wet!):
http://www.youtube.com/watch?v=t2cl8slHaUYAny questions, just ask.