Takes place after Magical Mystery Cure, and before Equestria Girls

After the Princess Coronation, Twilight and her friends are invited to a party celebrating Twilight becoming a princess, what they think is going to be a fancy dinner party turns out to be a run down pub. Twilight and her friends are convinced to fill up on wine and other drinks. After that is simply a blur to the group.

The group awakes to find out that they have sold the Elements Of Harmony to an unknown buyer, a furious Princess Celestia, And a very large headache.

The Mane Six must now get back the Elements Of Harmony, and along the way, discover how stupid they made themselves look at the party.