This tale is set in the Solar System Services, Inc., universe a few centuries after Alone is Not Lonely on the planet Onizuka. Because the planet's tilt is greater than that of Earth and has a slower rotation, it experiences longer days and nights depending on the season. Most colonists live in the equatorial band, but some hardier souls live north or south. Travel during Onizuka's winters are next to impossible.
As a result, the colonists have found some of Earth's historical stories and culture provides them with the means to survive an Onizukan night. Some whimsy remains though. The colonists won't waste edible pumpkins and turnips as Jack O' Lanterns, so they carve native pink-fleshed tubers for their Halloween tradition.
And if the name is familiar, I wrote a college paper about the cultural contributions of Japanese-Americans, including NASA Mission Specialist Ellison Onizuka prior to the Challenger disaster. He'll always have a place at my table.