Forgot to add a quick walkthrough for anyone who might be stuck:
In the front entry is a plaque that tells you the names of each Wing, save for Wing 3 which is rubbed out.
1: Buttons. The front entry, Wing 1 and Wing 3 each have a small gray button on the wall. You have to activate them in just the right order to cause a piece of paper with a clue to appear. The order is meant to be found by trial and error as opposed to a hidden message. The order is Wing 1, entry, Wing 3.
2: Lockbox. In Wing 2, is a lockbox with a color code. The code is the colors of the pumpkin in squashes in the painting in Wing 3. Orange, purple, green, yellow.
3: Exit. After pressing the buttons, a message telling you the code is the first letter of each word is revealed. The words are the subject of each wing. The first 2 are shown on the plaque, though third is hidden in the lockbox which contains a flier about the OpenGameArt Jam theme, gourds. This is implied to be the name of the third wing. Go to the code lock by the front door and enter the first letter of each wing: MLG. Click "ent" and click the doors to leave.