NB: I am not planning this event, just simply listing it to get the word out.
5k timed run through the woods of the campsite.
May 2015 event had about 100 runners, 90-95% Male
For more info and to register for the run:
The Naturist Foundation is a bona fide family orientated naturist club situated in 50 acres of woodland, and with a membership of over 400 members.
NB: I am voluntarily publicising this event; I am not the organiser of the event or responsible for it or its organisation. I WILL be there running at the event, however. Please address all registrations and/or questions to the Naturist Foundation via the link above. Thanks!