From Disney's website:
Minnie’s Seasonal Dining
Mingle with Minnie and her friends at delightful dining parties throughout the year.
You’re invited! Meet Minnie and some of her famous pals for lunch and dinner celebrations serving up seasonal deliciousness. Guests can pose for pics with popular Disney Characters, say “hi” to those stopping by and engage in table activities geared to the theme. Plus, the party gifts make great souvenirs!
Minnie’s Seasonal Dining events cost $50 per adult and $30 per child, plus tax and gratuity. Some dining plans accepted.
Don't miss your chance to attend the following events:
Springtime Dine
March 12, 2018 – June 3, 2018
Shake off winter’s chill with a divine dinner party that marks the bright and beautiful delights of spring!
Summertime Dine
June 4, 2018 – September 2, 2018
Head to Hollywood & Vine for a beach-inspired bash celebrating the sizzle of summer!
Halloween Dine
September 3, 2018 – November 8, 2018
Visit Minnie’s favorite happy haunt for a spooktacular Halloween feast that’s frightfully delightful.
Holiday Dine
November 9, 2018 - January 6, 2019
Deck the halls at a dazzling dinner party filled with holiday cheer and the joy of the season!
Reservations at Hollywood & Vine are highly recommended and can be made up to 180 days prior to your visit. Please note: All Character appearances are subject to change.
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https://disneyworld.disney.go.com/dining/hollywood-studios/fantasmic-dining-package/