Although this might not be quite what is wanted, I though I'd post it up anyway because it might be of interest to others too:
http://underthefringe.com/blog/2012/05/ ... derground/
I think they are interested in volunteers to help out in other ways too and there is a (small) film element in the Fringe (Buxton shorts competition) shown at Underground Venues.
I know the people involved and not only do they run this venue during the Buxton Fringe, I also know that Yaz is very interested in film making, so he might be a good person to get to know.
The other possibility is to join Shooting People. There are countless low-budget, independent film makers out there looking for people to help out. Also, go to as many film festivals as possible and do some networking! Take a few business cards along, collect all the contact details from film makers that you can and follow it up with a contact after the event.