I did this last year it was brilliant , amazing location ,
copied below is a bit about it and a link ,
Now in its third year, RunYHA trail running event held at YHA Castleton Losehill Hall in the spectacular back drop of the Peak District. With a whole host of races and running-related talks and film showings taking place over the weekend, plus the option of staying over to boot – RunYHA is truly a weekend to remember. With shorter runs and a half marathon through the picturesque scenery of Castleton, and an awards presentation for the winners, there’s something for every kind of trail runner.
follow the link below to their website,
http://www.yha.org.uk/things-to-do/activity-breaks/running/runyha