Fail.
All Hallows' Een, or All Saints' Eve in modern vernacular, was a 
Christian celebration of Christ's victory over sin and the works of the devil. When the gospel reached the British islands Christianity confronted the pagan religions of the Celts, one of which was Samhain, which was a celebration of harvest's end and the coming of winter. It was a variation on a common event in hundreds of other harvest religions that were very common in the pagan world.
* As the gospel spread it assimilated and 
overcame every single different worldview it encountered. In the case of Hallows Een, the Christian event 
mocked the demonic claims of the Druids. Jesus won.
You and many other Christians live a Christian still thinking evil spirits have power over you. The rest of Christendom walks in victory as overcomers. No Christian celebrating All Saints' Eve is inviting evil spirits into their home with candy. That is just nonsense. In my case, I met every single neighbor in my larger neighborhood and them, "
Happy All Saints' Day!" and those who asked me what in the world I was talking about were told the gospel and the paragraph above, told about some of the "good" churches in my area 

, and invited to attend church with me this morning. My next-door neighbor went to church this morning. He hasn't attended church (as far as I know) since he moved in two years ago. I noticed he, his wife, and their toddler dressed up and leaving home this morning and this afternoon when I saw him mowing his lawn, I asked him if he'd gone to church. He said yes and explained his doing so as something he and his wife have been considering now that they have a child and 
they'd have taken me up on my offer, but the wife was raised Baptist. I don't take any credit for that because.....
ALL GLORY GOES TO JESUS!
Unless you're a Christian who thinks evil spirits can be invited in with candy 

.
Besides, the op is a joke. 
* All religions outside of Christianity can be reduced to one of two options: They are all either 1) a harvest religion, or 2) a form of Gnosticism, or 3) a mixture of both.
.