I know that this is a L O N G way off but would you consider offering the chance for some people to come along for the morning meet (bacon butties) and the chippie bit, but without the laning. As you will be doing this for charity you might attract some people who might not be interested in the laning but who might contribute (maybe half) for the chance to meet others and be part of the event.
It's not as if it isn't a glorious part of the country in which to spend a day. If it's not too much trouble, you might even be able to suggest a couple of spots from which to view and maybe photograph the laners as they pass through.