If you have children, and even if you don't, it is a good idea to bring hand sanitizer. Your children will be touching everything in sight, the line for the bathroom will be long, there are farm animals and there are thousands of people. A lot of the food is finger food and you do not want to be worrying as you eat.
It is important to understand the admission policies so that you are not caught unaware on your trip. There are metal detectors at the entrance and you may need to have your bags checked upon entry. People under the age of 18 will have to be accompanied by an adult after 6 pm.
: The Wisconsin State Fair website offers a wealth of information about the fair. You can find out the varied food and plan your day. You can find out about the various events start times and end times and, most importantly, the distance between these events. They even have a useful map if it is your first time at the state fair.