Yes as per program - Dreams is on at park closing every night so that's 19.00 on Wednesday and then as part of the special Halloween ticketed event it will be shown again at 1.00 am
Unless of course they change it again It will definetly be showing to the general public on the 31st on or around park closing but as every year it's chaos when they do the cross over from the general public to the Halloween ticket holders it could be 15 minutes either side.
Check with City Hall and then CM's throughout the day would be my advise.