Good luck with the new classes. From my experience, I would say the first couple of years are the worst, trying to find people to enter the class, but after that it picks up. You might need to round up a few entrants yourself, initially.
Another class I have helped get set up at a couple of shows, is the fleece on the hoof class. In both cases I asked for it to be open to all breeds, including commercials, but mainly it's Shetland breeders who compete. It doesn't have to be pedigree sheep in the FotH classes - even wethers can be entered, as well as cross breeds. In both instances, the British Coloured Sheep Breeders Association has contributed rosettes, for both white and coloured sheep. I couldn't persuade either show to include fibre goats.