The KCCI report states that a moon can appear blue if the atmosphere is filled with dust or smoke particles of a certain size (like a volcanic eruption) according to timeanddate. Halloween, Thanksgiving, Christmas, and New Years better be on point in 2020. For people who celebrate Halloween in a spooky manner, this year's blue moon which is much special than a full moon will give a chance to navigate their night journey in the handsome moonlight.
The first full moon of October isn't forgotten though, because its actually the Harvest Moon. The phrase refers to the time when a second full moon occurs in one month.
However, according to Farmer's Almanac, seeing one on October 31 happens only once every 19 years. As it was such a rare event, it got the name blue moon.
According to an article by Sky and Telescope, the term "Blue Moon" has already been around for 400 years, giving birth to different meanings and was used to either say "absurd" or "never" in the 16th century and 18th century, respectively. Since a Blue Moon is the second full moon of the month, I would say it's even rarer for Halloween to line up on the same day as a full moon. These moons look the same as any other.
Don't expect a giant blue orb in the sky though. Be that as it may, in 2020, October will have two full moons - one on Thursday, October 1 and afterward again on Friday, October 31, otherwise called Halloween.