How about camps - not festivals, just places where people camp together for the weekend just to sing and play and dance. You only pay the camping fee, like the Mudcat Yorkshire Gathering which couldn't happen this year. In Foaotmad we'll be having 6 or 7 this year, where 70 or so people will play and swap tunes all weekend. I'm just setting off for one at Sacrewell Farm near Peterborough.
Cheers
Ray