During what started as a perfectly fine Lunch, Twilight learns that her friends have somehow gotten it into their heads that she is in a relationship with her mentor and idol Princess Celestia.
One night a year, on the Eve of the Summer Sun Celebration, Princess Celestia is sad, at least according to Twilight's observations. She has a plan, a boardgame, and is determined to try to cheer up her mentor.
Twilight is confused when she receives an invitation to a party that seems to assume she has a plus one already. Celestia is confused that Twilight is confused. They are dating, right?