It's been a while since I tried guessing anything, so I'm going to give Clue #8 a shot.
Two GIFs on two different sites with not much common. One is of Summer throwing a molotov cocktail setting a car on fire. The other is Summer looking excited (and her parents horrified) at someone strung up by balloons fly away.
Firefly is a spaceship in the show by the same name, piloted by a ragtag crew.
Also, unless its a complete coincidence, Legacy posted a Nathan Fillion GIF above when someone mentioned the codename Ragtag.
So, I think we're looking at a house set on a space ship or space station of some kind. Not sure if it's Interstellar Terror, or Invasion!, or something else entirely, but at least that's my idea for the setting.
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EDIT: I'm rewriting my guess for the theme here, first the clues:
Fireball - Stranger Things
Dynamite - Trick r Treat
Coach - Poltergeist
Surprise - Happy Death Day
Zero - Dead Exposure: Patient Zero
Poison - Body Collectors (Switchblade GIF is Jack the Ripper, "That Doesn't Make Any Sense" is Shadybrook, Froopyland is Terra Cruentes, the set is an analogy for the franchise's past houses)
Meteor - Path of the Wicked (Scary Tales)
Snacks - Either Hallow (Pickle Rick is a proxy for a Jack 'O Lantern/carved turnip) or Creatures! (People as food). I'm leaning towards Creatures! because we already have Trick r Treat this year.
Ragtag - Interstellar Terror
Feature - Shrek's Mystery House
Coupled with the #BeKindRewind clues and "the past coming back to haunt you", I think we're getting a
10 year Reflections of Fear anniversary, minus any houses with rights issues.