Thank you, Knight N Gale for the new title! (previously Wacky Weekend)

Celestia feels as though she has been in a rut. Thinking of a way to spice up her weekend off, Discord comes in with a proposition. Just to make things interesting, Luna also came along for the ride, despite not being given any notice.
They will spend the weekend as Rarity and her little sister Sweetie Belle, and vice versa.
Problem is, Celestia has the weekend off, but Rarity does not. What is she supposed to do now?
How will Luna deal with being a filly? How will Rarity and Sweetie act as royalty?
Will Discord have enough popcorn to last him through the show?
Let's hope everything turns out okay.

Inspired in part by Freaky Friday, though it is not the same premise.

Artwork made my marking