Unfortunately, no. This will be strictly enforced by security. You should make sure you have everything you need before entering the event. If you go outside the gated area after entering the event, you will be required to pay $75 per person to re-enter.
There will however be a designated area just outside the front gate for smoking. Smoking is strictly prohibited anwhere on the fairgrounds. Also Coat Check service will be provided near the door and Lost and Found will be located at the Coat Check desk.