Once upon a time, in the magical land of Equestria...
One week ago, Twilight Sparkle was crowned the fourth Princess of Equestria. Tonight, Ponyville hosts the 1003rd Summer Sun Celebration, and Princess Celestia and Princess Luna want a vacation. With two fine young princesses like Cadance and Twilight to take over for them, nothing could possibly go wrong.
(Title image hacked together from vectors by sakatagintoki117 and Chrome-MMVII.)