Mia is excited to enter a Design-a-Dress contest, but she's pressed for time. And when she tries to finish working on her dress during a Halloween cupcake party, it's a recipe for disaster!When Mia reads about a Design-a-Dress contest in a magazine for "budding designers ages 12-16" she is excited. But she doesn't realize how much work designing-and sewing-a dress truly is until she starts on her contest entry. While Mia stresses out about all the work she has to do, she and Katie have an argument about, of all things, fashion preferences! Katie offers suggestions that don't really go with the outfit Mia has in mind. And when Mia makes (what she thinks) is an offhand joke about Katie's fashion sense, it turns into a full-blown argument.As Mia tries to finish working on her dress during a kids' Halloween cupcake party, she realizes that kids plus cupcakes plus silk dresses plus frosting equals a recipe for disaster!