I haven't seen the one in WDW, but the brief description on the Disneyworld website sounds very similar. When I saw the version at DCA, the basic story was that Mickey and the gang were planning a birthday party for Minnie and they each need help with some aspect of preparing for the party. The "help" (i.e., lesson) is comes in the form of short vignettes featuring Sofia the First, Jake and the Neverland Pirates, or Doc McStuffins. The kids (and parents that want to) all sit on the floor in front of the stage and there are some interactive elements (e.g., confetti falling from the ceiling). There is one (I think) live performer that acts as the narrator. It was a cute show.