I personally wouldnt think it will be too bad. If theres a massive queue at the ticket booths it doesnt really mean its going to be rammed and have massive queues so dont be fooled. I once went like the first week of fright nights and it was dead, and I mean literally everything was walk on but Thorpe nowadays is gonna pretty much always be abit busy.You should be okay, although ild expect queues no longer than 20 mins. The fact that the date your going falls on a fright night means people will be turning up around 4pm, so thats when it will start to get abit more busier.Have a great day though!