From what I understand, *trick-or-treating* on Halloween evening/night (at least in the US) has been on the wane for quite some time now.
Not saying it still doesn't go on, especially in certain neighborhoods or social groups or whatever. But overall, the trend for that is down.
However...
Other things have been on the *rise*!
For example, instead of parents taking their kids trick-or-treating (or letting them go, or passing out candy at their door), what many of them have been doing is to have parties at home for themselves & friends/family. Food, drink, music, etc. Kids still get to wear costumes -- and even some of the adults may partake!
Another example (and this has been going on for a loooong time), is for young adults (say, 21 to 25) to throw on costumes & go clubbing. Loud music, skimpy outfits, lots of alcohol -- and hooking-up.
Though that latter trend has been rising in age, as well. Late 20's, 30's, even 40+, have been joining in. Heck, back during my en-femme days, the oldest GG in my social circle who got all dolled up for Halloween clubbing was something like 55 years old! (And she had the body of a hot 20-something, no joke. )
Anyway, no one has to do anything, obviously. But Halloween has definitely shifted, here in the US.
It's still about the kids -- though it's also way more for adults now, too. And that is definitely a good thing for a CD'er.