Hello Kenneth and welcome to the Disney Parks Moms Panel.
It's always an added pleasure for me to assist a fellow Guest from the United Kingdom with their jolly holidays to Walt Disney World Resort!
I'm thrilled to know you've an extra magical trip planned for this coming September and have already made some great choices by scheduling
Fantasmic! into your stay and having utilised the
Fantasmic! Dining Package several times myself I can certainly highly recommend it to you.
On your behalf I just checked availability for
Advanced Dining Reservations for the Fantasmic! Dining Package at the
Hollywood & Vine on 15th September and at this point in time I
can see availability for tables at both lunch and dinner times... I can only imagine that perhaps more reservation times have opened up since you last were able to check.
Autumn at Walt Disney World Resort is such a beautiful time of year and as you mention Guests can partake in
Minnie's Seasonal Dining at the Hollywood & Vine which from September 3rd will be
Minnie's Halloween Dine. Plus you'll no doubt be happy to know that this fun sounding party can be enjoyed as part of the Fantasmic! Dining Package too!
Have a great Disney day.
~ Jane