I think the important thing is for Sam Smiths to be informed of the trouble this has caused - in particular for this fesival. If regular festival folk can't take the time and troble to pass on how they feel - this owner and other will know exactly how much notice to take of folkies as customers.

Perhaps they are right to ignore it?

Many folk arriving will not be aware and will expect things at the Plough to be as usual. Perhaps a petition could be arranged that would show the true strength of feeling?