We will be at the Taste of Chicago on Saturday and I had the same question. I did find that there is one food truck call TreSa's gluten free food truck with gluten-free jerk chicken (https://chicago.suntimes.com/news/taste-chicago-restaurants-every-food-item-opens-wednesday-ultimate-guide-directory-everything-you-need-know-oasis-summerdance-festivals-summer...