The tradition of Halloween was brought to the US by Irish immigrants, but it's now celebrated by ALL children here (mainly as a way to stock up on candy for the year :)), by the candy and costume-making industry for obvious reasons, and by adults who get creative for costume parties - which can be pretty fun.
Halloween originated from the ancient Celtic festival Samhain, which is a harvest festival. During this time, the ancient pagans stocked up on livestock meat for the winter, and built huge bonfires where the slaughter waste was burned. Since winter was a time of disease and death, which they associated with evil spirits, they wore costumes and masks to ward them off, or to mimic them.
The name itself comes from All Hallows' Even (for evening) as it is the eve of "All Hallows' Day" or "All Saints Day".
A couple of houses have got this giant spider web with a giant yellow & black spider, which I hadn't seen before. In one house they had set it up to go all the way from a tree to the ground, which looked great. But I couldn't get a picture of that one. One of my neighbors had it too, and I got a picture of theirs.
There are the ghosts hanging from trees, of course.
And witches with poor navigation skills ...
I didn't carve my little pumpkin this year. No specific reason why not ... but here's my power-point Jack-o'-Lantern.

There usually is a pizza gathering on our street on the evening of Oct 31st, to which parents bring kids in costumes. After the get together, the kids go trick-or-treating. I haven't yet bought treats ... am thinking of buying dried fruit packets this year, to make it a little healthy.
The setting sun lights up the neighborhood during our walk. There are lots of deer here too. Didn't see one on this day, though.