We could make up a backstory fairly easily. Aladdin and Jasmine's the only ones around who live far away from the rest of the Princes and Princesses. The rest are all Caucasians and it's not too far-fetched to think they're coming together on some social occasion or other.  Only...would this begin as a sort of gathering for royalty, or will we start out in our native kingdoms and mingle later on somehow?