To echo what the PP said, if cross contamination is a problem for you, then you may be out of luck. The kiosks are really small, and even if they did get a whole new prep setup out for you, I doubt it would be gluten free. If you only have to worry about significant amounts of gluten then ask at the festival information desk, and you may be able to find a few items there that are gluten free. I think they have 5 or 6 items that are Lacto/Ovo Vegetarian friendly which is different, but they do try to have items that are ok for all types.