The Grand Galloping Gala. A night of magic, joviality, and class. Truly an event every last pony in Equestria would do just about anything to attend.
But what if, Celestia forbid, your best friend gets an invitation, and you don't?
For two particular unicorns, the outcome isn't going to be pretty.
Gala Ticket source: https://www.deviantart.com/noxwyll/art/Grand-Galloping-Gala-Ticket-258779962