Hi Andrea,
According to the Park Schedule for the
Magic Kingdom Park on the Walt Disney World website, once the last
Mickey's Very Merry Christmas Party has taken place on December 22, 2016,
Wishes nighttime spectacular will be replaced by Holiday Wishes - Celebrate the Spirit of the Season each evening from December 23 - December 31, 2016.
On January 1, 2017, it will revert back to Wishes nighttime spectacular.
So, if you are planning to visit the Walt Disney World Resort sometime during December 23 - December 31, 2016, you will indeed be able to see Holiday Wishes - Celebrate the Spirit of the Season without purchasing Special Event Tickets to Mickey's Very Merry Christmas Party.
Wishing you a magical trip filled with memories which will last a lifetime!
Emma