Starlight Glimmer and Twilight are invited to Canterlot High for... a new Fall Formal. Twilight is taking her werewolf boyfriend, along with Spike and Ember.

But, Spike and Ember also took Garble, Discord, the CMC, and the rest of their team for the fall formal prom.

Starlight even decided to take Sunburst with her. But, she needs help with finding a dress. Actually, all three of them Starlight, Twilight, and Ember need dresses.

(Well, Rarity already found them and had given them to her friends for free. So, in the first chapter, that will not be mentioned. After all, they're in the Carousal Boutique for crying out loud.)
But, back to the others, the dragons are going to make this the best night ever with funny stuff.