I have to start by saying that Halloween is probably my least favorite holiday. I have nothing against the candy, the dressing up or the visiting neighbors. Possibly it could be the begging door to door, or that we see high school students doing it. It also could be that being scared or scaring someone is not my version of fun. I can think of better things to do.
When I took over the preschool program where I am at years ago they had a long tradition of dressing the kids in their costumes and going throughout the campus to all of the offices. The kids could show off their costumes and get candy. Even 13 years after ending that practice I still have long term employees of the university who say they miss it.
It is appropriate to ask, "What is the educational value of doing this?" Back in the day when children and their parents created costumes out of whatever was available in the house it was not such a big deal, but today where most costumes are bought with little to no planning or preparation all of the value of the holiday is lost. On top of that, should the costume get damaged in any way while at school you then have both an upset child and an upset parent. Some parents have said that "I just don't understand how much their three year old looks forward to Halloween."
Really! Let's see, she was two years old last time Halloween came around and was that memory something she had or reflective of you and the media hype of the holiday.
I love holidays but they need to be a chance to celebrate and not a chance to buy happiness. So on Halloween I have be home with my 400 pieces of candy by the door, hoping that only 100 children come by and looking forward to the end of the evening, hoping everyone made it home safely. Have a great day.