Hiya Donna!
Welcome to planDisney! Get that reservation my friend and don't let it go!
Be Our Guest Restaurant is just beautiful and my favorite room out of the three will surprise you. It's
"The Rose Gallery" which makes me romantically imagine how the love of Belle and Beast continued after the movie. When you arrive you can ask for a specific dining room and while it's not guaranteed, Cast Members will try their best.
If you have a 5 or 5:30 pm reservation for Be Our Guest Restaurant feel free to enjoy it and don't forget the grey stuff. However, since you don't have tickets to
Mickey's Not-So-Scary Halloween Party realize that as 7 pm approaches you will find yourself kindly escorted to the Park exit. Only guests with the special event wristbands will be allowed to stay after 7 pm. I have seen guests with even later dinner reservations and they were escorted out by Cast Members right from the restaurant. You will even hear several announcements reminding guests about the Party and asking non-ticket holders to proceed to the exits. So don't fret, enjoy your meal and plan for a lovely evening stroll home.
I would, however, definitely consider getting tickets to the Party. It's a lot of fun and being able to trick-or-treat in Magic Kingdom Park while singing along to the Sanderson sisters is perfection. My absolute favorite moment is seeing the headless horseman ride down Main Street, U.S.A. before
Mickey's Boo-To-You Halloween Parade begins. That's just the icing on the delightful Halloween cupcake.
I hope this helps and if you have any more questions please
let me know!
Happy Planning!
-Nimmy