Whether you provide entertainment at your festival will totally depend on your space and the attitude of your vendors. Some vendors prefer not to have entertainment because they feel people will be distracted from buying. With entertainment - The next year I had two attractions, clogging and our local Sousa band. The men and children loved it while the mothers and wives shopped. Funding for the entertainment - I learned to set aside an amount of money I wanted to spend and stick to it.
Good entertainment is hard to find and can be very expensive.
Inviting cloggers became expensive because you had to build a stage for them to dance on and had to pay them too. Try and keep low key in your entertainment and keep the music more to your herbal theme. I felt would answer my problems with entertainment. One thing my festival lacked was something for the children to do. They had planned art projects, story telling, songs and all kinds of wonderful things for the children to do.