October 31 plays host to not one, but two major celebrations: Halloween and Dia De Los Muertos.

For many Americans, Halloween is about candy. But, there's much more to Halloween than this, though getting dressed up for free candy is nothing to be downplayed.

Around the year 1900, Irish and Scottish immigrants brought "All Hallows' Eve" to the U.S. That’s where it all started. Trick or treating, on the other hand, started around the time of World War II. The "trick" in "trick or treat" means if you don't give up the candy, there may be a prank played on you.

According to the National Retail Foundation, they're expecting over $9 billion to be spent on Halloween this year, most of it on costumes, $3.4 billion to be exact, with $2.7 billion projected to be spent on candy and decorations, respectively.

And Dia De Los Muertos, the day of the dead, is a Mexican holiday that gathers family and friends to remember those who've passed away. The dead are honored with their favorite food and beverages at private altars and grave sites. The Day of the Dead is more than just one day, it starts Tuesday and ends Thursday with All-Souls' Day.

This tradition of honoring the dead is goes back 3,000 years to the Aztecs. It's a national holiday in Mexico!