For widget, the EMH for Wednesday, Dec 21 at MK would be at night (to midnight) (Wednesday is a usual MK EMH night). The wrist band you can get at various places in a park before EMH starts and they never run out -- they are just to show that you are a WDW resort guest entitled to stay and get on attractions during the EMH time (and so that others still wandering around who don't have wrist bands will be asked eventually to leave and will not be let on the attractions) The midnight closing on the 17th corresponds to the 11 or later that you will see for every Saturday night in December. It is not an EMH night but the regular closing time WDW has established and generally indicates WDW expects a huge crowd for that particular day and thus the late closing.