So anyone who's played Style Savvy (anyone?) knows that whenever a full moon shines over your town, the game progresses. New shops will pop up, new buildings will open, and your store may even get larger.
But why a full moon?
After a brief discussion with a close friend, we came across the most viable probability: Werewolves.
It's the only thing that makes sense. Every time a full moon hangs over the city, werewolves rise from the depths... and get to work. I don't know if they're contractors or if they get picked up en masse from Home Depot (many are open 24 hours), but clearly, werewolves are building this town from the ground up.