It's Nightmare Night in the Different View Universe(Though in this world,it's called Darklight Day),it is a holiday created by Princess Luna herself in an attempt to reintegrate her younger sister into the modern day world, however Celestia is not really used to being around others just yet,so Luna has a plan... Send her to Ponyville.

Glitter Brightstar on the other hoof has invited all of her friends to go Trick or Treating with her, they have no idea that a certain Princess will be joining them...