Angelina, Viki, and Gracie have a sleepover the night before the Silly Hat Carnival, but stay up too late and then oversleep, causing them to miss an important ballet rehearsal. Ms. Mimi cancels lunchtime rehearsals when Angelina and her friends are too loud, noisy, and messy, leading Angelina to host the rehearsals in her attic dance studio.

Angelina and Marco overindulge in candy canes and gingerbread cookies prior to a performance of "Dance of the Sugar Plum Fairy". Angelina is excited about seeing "The Nutcracker" and invites two of her friends to go with her but then realizes she only has one extra ticket, so now she has to decide between Alice and Viki.

Angelina, Viki, Gracie and A.Z. work together to develop a dance for class, but Gracie and AZ disagree over what the dance should be, so Angelina must find a way get everyone to agree with each other. Alice adopts the persona of her idol, Russian gymnast Anna Mousikova, after Miss Mimi assigns reports on the mouselings' heroes. Alice became so obsessed with her idol, she distances herself from her friends.

Gracie contemplates copying an established dance for Make-It-All-Up-Day when she cannot come up with one on her own, but Angelina persuades her to improvise a new routine. Angelina has second thoughts about playing the main part in a school play "Once Upon a Pillow" when she learns her character is asleep for most of the performance.

The mouselings learn about jazz dance, improvisation, and poetry, but when they have to present poems to the entire class Alice develops a serious case of "tummy butterflies" and Angelina must help Alice with memorizing her poem. Gracie, who has been tap dancing for years, forgets practicing in favor of learning magic.

Angelina tries to support Marco in the Mouse Marathon, which includes forming a cheerleading team to cheer him on, but all the attention unnerves him. Angelina opens her own ballet school in the attic to teach Polly ballet, but her overbearing manner soon causes her sister to quit.

Gracie, Angelina, Viki, and A.Z. think they heard a mysterious tapping noise in Roquefort Hall is from a ghost. Angelina's friendship with Gracie is strained due to the many friends that Angelina has and the limited time she has to spend with each of them.

When Angelina, Viki, and Marco mistakenly think Ms. Mimi is getting married after overhearing her talking on the phone, they learn about wedding marches and organ music in order to make her wedding day special. Angelina receives a Valentine card from a secret admirer.

Angelina helps her dad take pictures of Camembert Academy and its students for a Mouseland Herald story, but the assignment turns difficult because Gracie wants to be in every shot. Angelina helps A.Z. learn the complicated "Cheese Roll" dance.

When the mouselings cannot agree on the music for a show, Angelina forges a compromise by applying a lesson from a science project. Angelina is set to direct a hip-hop dance show, but it may not go on when A.Z. hurts his foot.