The other approach (and one we employing for BAMfest) is to ask the pubs that will host the sessions to sponsor the festival ..... seems to be working very well for us.

And the local brewery (Theakstons -lucky us!) is the main festival sponsor too ......... just to make sure we have the whole supply chain contributing.

We will also charge session goers for camping if they want somewhere within handy walking distance of the session venues (as well as performance venues) to stay.

That all seems fair to me!