Once every month, a silent man in a crimson cloak walks the hallways of the House, delivering invitations to the Ball. He brings it to those of all classes and groups: rich and poor, natives and visitors, human and otherwise.
If you are invited, you may choose from a wide variety of costumes in the nearby storage room. You can be anything you want: a knight, a gentleman, a harlequin, a monster. (Or if you are already a monster, you can be an ordinary human being.) As long as you wear them, your true nature is unknown to all around you.
The Ballroom is a beautiful and elegant place. Globes of light float in the air. Eerie music comes from a distance and no one can see those who make it. But if you go to the Ball, take care not to stay too long. For the longer you wear the mask, the more you begin to forget who you truly are. And some masks are not so easy to remove.