Thanks to everyone for their suggestions and input.
I think we are all finally ready for Halloween!!
I told everyone that they will feel really out of place if they are not dressed - so now everyone has come up with something to wear. I passed on a couple of suggestions that you guys mentioned. We are all keeping our costumes a "secret", so I have no idea what the others are wearing at this point in time.
I do have decorations for all 12 doors (they do not know anything about that)...and I plan to put them on the doors the first night after they have all gone to bed for the night. Hopefully, they will be pleasantly scared, uh I mean surprised when they see their doors in the morning!!