Princess Luna, the guardian of the night, peacefully rules over Equestria alongside her big sister. When the Cutie Mark Crusaders suggest she should have a holiday as equally prestigious as Celestia’s Summer Sun Celebration, she declines. Luna isn’t comfortable with such attention–especially after all the terror she caused as Nightmare Moon. So when she realizes Celestia is orchestrating a surprise festival in her honor, she decides to have some fun and take matters into her own hooves. What’s a princess of darkness to do?