Well, just keep it outta the fan club. 
How would she spend Halloween?
She would spend it with Marlene and Denzel trick or treating with them because Tifa would probably be way too busy at the bar to do it herself. And Aerith could be like their aunt her something so it makes sense she'd watch them and make sure they didn't get hurt while trick or treating.
Then after that, she'd probably head off to their gang's very own Halloween party for some fun with her friends.

How would she spend Halloween?
She would spend it with Marlene and Denzel trick or treating with them because Tifa would probably be way too busy at the bar to do it herself. And Aerith could be like their aunt her something so it makes sense she'd watch them and make sure they didn't get hurt while trick or treating.

Then after that, she'd probably head off to their gang's very own Halloween party for some fun with her friends.
