It is the day of the Summer Sun Celebration, and Princess Celestia is coming to Ponyville. Twilight Sparkle is overseeing preparations yet again, and has meticulously planned every last detail to ensure that everything is perfect for her mentor's arrival. Nothing is going to go wrong.
Except when the big day comes, Twilight has gotten four hours of sleep and Fluttershy is nowhere to be found. Pinkie Pie sets off after her with nothing but a dark coat and the voice of a chain-smoking stallion, and the Apples and the Carrots are at each other's throats while Rainbow Dash is attempting to fill in for Fluttershy.
As her plans collapse around her and Ponyville descends into chaos, Twilight Sparkle must focus on obtaining the one thing that can set everything right: the all-powerful, awe-inspiring magic of caffeine.