Why is Trick or Treat on a Thursday in Blair County? We Don't Know, But Others May Have It Right

Susie Crawford sent in this question last week:

I have lived in Altoona for 12 years now. I’m 68 years old. I’ve made many friends my age and they were born and raised here, and they can’t answer this question, so maybe you can, please.

Why does Blair county celebrate Halloween the last Thursday of October?? No one seems to know the answer. Do you??

Unfortunately, we did not know. We posted this to the Morrisons Cove Herald Facebook page:

We had a question today asking why Blair County always holds trick or treat on a Thursday. We did a really quick review, and found an Altoona Mirror article...