Hi Donna, welcome to planDisney!
Magic Kingdom Park will typically close at 7:00 p.m. on nights when
Mickey's Not-So-Scary Halloween Party will be held. If you have an
Advance Dining Reservation for
Liberty Tree Tavern any time before then, you are welcome to stay and enjoy your dinner without rushing. Once you have finished your dinner, you will be guided toward the front of the park to exit. Similarly, if you enter an attraction or experience line prior to 7:00 p.m., you will be allowed to stay and enjoy that as well.
Since you will be visiting Magic Kingdom Park, be sure to join the virtual queue at 7:00 a.m. if you'd like to experience
TRON Lightcycle / Run. This attraction is very popular and the virtual queue seems to fill up in a matter of minutes. If you miss your opportunity in the morning, you can try once again at 1:00 p.m. as long as you are in Magic Kingdom Park. And if all else fails, you can purchase an Individual Lighting Lane reservation, if desired.
Donna, please let us know if there is anything further we can assist you with. Have a magical vacation!
Diane