There’s just a certain portion of the player base that cares about Halloween… I’m not one of those, it’s not a thing in my country.
The fact that they didn’t thought about the option of disabling it for us single players is baffling. All in all, if I don’t want to stay in darkness for a full week the only option I have is to prevent the game from updating until the event is gone. I’m not amused.
EDIT for update on the matter:
Tascha mentioned in the official thread that they’re looking at the possibility of adding more options to control the event including tuning down the darkness a lil bit maybe… so, I’m more amused now 
Yay for not having to fight Steam wanting to update the game for all week! 