There are discounted events for CMs. Usually in the first month of the parties (September & early Oct. for MNSSHP & Nov. For MVMCP). Later dates are sometimes released depending on ticket sales to resort guests.
The mystery one is kermit. if you click on the "?" picture it will bring up a picture of it, which in my opinion is the best one out of the set, followed by Swedish chef.
it is a spot where character's new friends finalize their training. an old roommate of mine recently became friends with several characters and was there for the first few days after becoming friends.