What is it like at the shopping mall (a) on Hallowe'en and (b) the day after?

[Fiction question]

I don’t know if I can force myself to go and see for myself. I’m sure some flutherfolk can describe it for me.

I’m especially interested in three things about Hallowe’en at an American shopping mall:

•   Is it heavily decorated? and just in the stores, or generally?
•   Is there much of a teenage presence, and if so, what’s it like?
•   Do you see many adults in costume?

As for the day after, is it like the mess at the end of a party, or are all the decorations still up, or have all traces vanished? These holidays tend to go stale the instant they’re over, just like Cinderella’s coach and gown, and then it’s on to the next thing. How is it with this particular event at the mall?