Have a look at your local government website, most seem to now have information on how they will treat events when the new licencing system starts this autumn. For instance
http://www.exeter.gov.uk/docs/licensing/ecc_guidance/gfs_registered_clubs.docsystem
makes it clear that you wouldn't be allowed to have the general public just turning up to a folk evening, they would have to be already members of the cricket club at least two days before the event.
for normal pubs, the new system has the clear advantage that no extra entertainments licence is needed for folk music and the two in a bar is ended. ( still PRS though ).

alan J.