RE. caravanning, recommend you contact the Bricklayer's Arms. They may be able to find you a space. Co-incidentally, it's also a good place for a session on the Saturday night.
Although the ticketed events are sold out, there's the Pig Dyke Molly social evening at St Andrew's church hall on the Friday night (a mixture of ceilidh, music and silly stuff) which you don't need a ticket for although recommend you arrive early. On the Saturday night there will certainly be sessions at the Bricklayer's and the Boat; other pubs worth trying include the Falcom, Letter B, New Crown.. I'm sure there are others.