Replying to ???How to not get caught photographing illegal things/actions??

My town has a 10ft cow for one of our biggest parades (we live in wisconsin) and its parked right in an easily accessible parking lot. I want to shoot one of my friends riding on it(would be at night) but is it possible to post it anywhere without getting in trouble? essentially, if the action i photograph is illegal and i post a picture of it, how can i not get in trouble? Or do i just not post it. shanks