Hello Daisy and welcome to the Disney Parks Moms Panel.
One of my favourite things is planning towards my families next magical trip to Walt Disney World Resort and I can't think of a better year for you to visit with your group of 20 than in the rather iconic sounding year of 2020!
I totally understand and can certainly relate to your great question as it's always good to try and look ahead and budget for a Disney trip. I think you're making a great decision by using the current pricing structure for 2018 and I can also recommend keeping close eye on any future or upcoming
Special Offers, Deals & Discounts.
To accommodate my family of 6 at Walt Disney World Resort I've often referred to
Rooms for 5 Guests or More or placed a request for 2 x connecting Resort hotel rooms during
Online Check-in. Most Disney Resort hotels benefit from connecting rooms and I'm happy to share that I've staying in those rooms with my family at Disney's Beach Club Resort, Disney's BoardWalk Resort, Disney's Grand Floridian Resort & Spa and at Disney's Animal Kingdom Lodge.
It is however worth remembering that although Cast Members will always do their very best to accommodate room requests like connecting or adjoining rooms they can never be guaranteed.
I also thought you may find this
Compare Disney Resorts planning tool to be an extra useful resource for your epic sounding 20/20 trip!
Have a great Disney day.
~ Jane