Hello, Deanna! Thanks for dropping by planDisney with your question! I'm guessing the excitement is mounting for your sailing next year. 
The 
Fantasy is a fantastic ship with so much to do and see onboard. You are going to have an amazing time! As it turns out, the themed night schedule hasn't yet been released for your sailing. However, I'd expect that one night will be Pirate Night, with the suggested dress attire for the remaining evenings onboard listed as Cruise Casual. 
Pirate Night is a fan-favorite filled with spirited activities. Think themed music, Character greetings, games, and a deck party complete with fireworks. If you have a pirate costume or scallywag-suited accessories, pack them to join in on the fun. You'll also see pirate-themed merchandise for sale in the shops on the ship (just in case you are fresh out of pirate gear).
While onboard the Disney Fantasy, I highly recommend that you give the 
Midship Detective Agency a try. This interactive game will have you exploring the ship to solve a mystery for Mickey and his pals. The best part is that this game can be played in segments and can be tailored to your schedule. Just take good notes on your case file and pick up where you left off!
Have a wonderful Disney Cruise! Sail back to us if you have more questions. We'll be here for you!
Adrianna