It all culminates in a grand dance ("With a Smile and a Song"), as the Merry Makers invite all their special guests to join in the fun on this special day in Magic Kingdom Park.
Starting on September 2, 2016, during Mickey's Not-So-Scary Halloween Party, the ending of the show was revamped with new costumes and a finale song celebrating the autumn season, which replaces "With a Smile and a Song".
By November, it had a Christmas finale with a few Christmas songs prior to the the dance.
Mickey and Minnie's updated looks (first seen at Shanghai Disneyland) make their North American debuts in this show.
Louis was withdrawn from performances during and following the show's premiere due to an incident where a two-year-old boy was killed by an alligator near Disney's Grand Floridian Resort & Spa, three days prior to the premiere. He has since been added back into the show as of July 13th, 2016. 
Although Olaf and Louis have articulated heads, they do not join in Mickey and the rest of the cast in singing a song in the dance and "On This Day" in the finale. However, Mickey, Minnie, Goofy, Donald, and Daisy do not sing while dancing during the Christmas version.