Currently, Penguin High 3 set is open. To get there, just head to the Snow Forts and click on Set A. Then, you're in! You'll have to dance in the classroom, the hallway and the gym to get your free background. Don't forget to pick up the free jacket that you'll get!
Now let's go further into the future - Set C which opens opens on the 17th! This is a science fiction film, where you can pick up your alien costume! You'll also have to do three special things to get a background, and Gary should be seen around here too :)