If you really want to gouge your mark on a folk festival, heres a tip:-

Try and spot anybody who has paid about two grand for a guitar - Martin, Lowden something tasty like that. Ask to 'have a look'. To achieve the maximum effect, you need a sharp belt buckle - American Eagle with sticky out wings is perfect.

Its amazing how few of these folk people have never tried to play Roll Over Beethoven with a really sharp pick. When using an old sixpence for this purpose - smile ecstatically and murmur, 'I just love Brian May!' or 'You could get a really great sound doing Stairway to heaven with this box, man - d'you do that one, man?'. Always finish off with Wild Thing. I have found an amazing number of folkies don't know these simple traditional melodies and have never heard their guitars played in this fashion.

Soon you will be able to spot your handiwork on all the main stages of England, and at every singaround in the country.