This story is a sequel to Closing Time
Since Trixie presented Starlight with a necklace and the two went out, they became closer and closer as each day passed, soon venturing into a happy, healthy relationship. Now, with tickets to the Grand Galloping Gala, Starlight is excited to take her marefriend along and have a romantic night together.
However, midway through the Gala, a rumor spreads that Trixie has went up to Prince Blueblood's bedroom and is having an affair with him.
So long, relaxing evening.
Minor spoilers for season 7