Hi Stacey,
Thank you so much for visiting the Disney Parks Moms Panel with your question.
Mickey's Not-So-Scary Halloween Party is such a treat. My family also attended in 2015, and it was so much fun to see our daughter's exuberance as she walked the park as her favorite character, Lilo.
We also saw the Hocus Pocus Villain Spelltacular, featuring the Sanderson Sisters, last year. It was such a high-energy show, featuring some of the villains who we do not usually get to see in the theme parks, including Oogie Boogie. It was great fun!
Specific details for entertainment at this year's Mickey's Not-So-Scary Halloween Party have not yet been released. I suggest that you monitor the link I included above, as well as the
Disney Parks Blog, for information about the entertainment that will be at Mickey's Not-So-Scary Halloween party this year.
Have a great time planning your Disney vacation, Stacey! Please do let us know if you have any further questions.