Okay so if we are doing this we should do it properly, and we don't have long to sort things out really
However by starting this off I am definately NOT volunteering to organise things!! (Im busy at weddings and stuff August b/h, and start new job very soon so don't have the time at the mo - sorry 
First off lets gauge interest and availability so if you intend to come reply below stating -
1 - Bike you will be bringing (this will help those of us that do sort a route out to see what sort of terrain we need to consider)
2 - Your ability and/or how far you would feel capable of riding (remember this is open country not a trail centre and the peak district is just that - peaks - so going is either up or down and either rocky or boggy)
3 - Where abouts you will be travelling from, or what time you can arrive and have to leave, if staying overnight say so to enable likeminded people to maybe look into booking the same campsite, B&B etc
4 - If your local and know the area, would you be willing to help organise and plan routes, advise people on accomodation etc?
5 - Anything else you can think of that might aid planning
I would then suggest we get a small group of us locals together (maybe a few weekends before at Woodbine Cafe / Ladybower Arms or somewhere) to sort a route, or maybe a couple of routes
Im also thinking if people are travelling down on Saturday and staying over the Saturday night then we could maybe have a warm-up ride on the saturday afternoon / evening, maybe at Wharnecliffe? - Caters for the downhillers in a big way but XC Monkeys will be happy too - what do you think?