What is the fear of Halloween called, in psychological terms?
 

samhainophobia

Samhainophobia is an abnormal, persistent and unwarranted fear of Halloween. The person affected by this phobia has a conscious understanding that the fear is irrational, yet the fear persists despite reassurance by others that there is no danger. The root word comes from the ancient Celtic ritual called Samhain, a celebration to honor the harvest cycle that ended Oct. 31. During the celebration, an animal's bones would be thrown into a roaring 'bone fire,' which later became known as a 'bonfire.'

Source: Forbes.com

My only fear on Halloween is that the trick-or-treaters will take all of my 3 Musketeers or Kit Kat bars, leaving none for me to snack on the next day :)

We think the same way. I miss handing out the candy and seeing the costumes of the kids. They only do the treat dispensing here in the Villages at some of the Squares on occasion and at Halloween festivals and the like.

You might get a drunk neighbor putting a "Boo" on you door. That's just a piece of paper saying you have been "Boo'ed"! Guess who. With maybe a treat or not depending how hungry your neighbor was at the time. Trend Alert: How to Boo Your Neighbor Ahead of Halloween | Babble