Sorry for the late response... We survived!!
Crowds were actually "manageable" but it was much busier than we expected especially compared to when we went last year. And an "annual passholders event" threw our whole plan for a loop.
Our idea was to go to Duff Gardens stay and scream eat a big pink donut drink dufftoberfest and then eat at Fast Food Boulevard then hit up all the back houses first. That area was only open to Annual Passholders (is there a way to find out when those events are in the future to avoid them). So we had a choice of Finnegans or Hello Kitty and we went with Finnegans which was really big, but still very crowded. We were starting to panic as this was a one night thing for us and we completely had to change our whole game plan.
Without going into too much detail we started with Stranger Things and bounced around the whole park. We still had a fantastic time and were able to do 9 of the 10 houses so it was an overall success, but it was HOT HOT HOT, and it was way more crowded than we prefer... yet the longest line we waited in was probably Poltergeist at around 55ish minutes
I might write a review in that section, but yes that Friday was pretty busy but still manageable... I wish it was open to 2 we def could have done all 10 houses.