Online publicity is premature in the UK. When you have someone really famous, send a publicity pic (agent will supply) and blurb to the local papers. Put posters up in local campsites, hotels, etc. Is there a tourists' "What's on"?. Flypost (or pamphlet) - other pubs, shopping malls, music shops. Offer local radio a live performance at the studio. If you have a family band with an eight year old singer, call the local TV station (don't laugh, it got my daughter in the Cambridge festival specials on Anglia one year. Network other clubs inthe area - you are not competition because they are on other nights. Send people to the Bedford Hotel, Sidmouth and announce!