if you look on www.wdisneyw.co.uk there is a link for MNSSHP (or a search option) which lists what rides are open, where the best trick or treat spots are etc. We arrived at 6pm (an hour earlier than the ticket says) and we got in no bother. You are given a wrist band for party ID. On arrival everybody (not just the kids!) is given a trick or treat bag. It really is not a night to be missed! A word of warning - if you go NOT dressed up in fancy dress gear, you will be the odd one out!!!! Any fancy dress goes - not just halloween types. ENJOY! 
