Lots of websites recruiting people with RVs to come by and work the 2-3 week season. Others stay in motels or live close enough to drive.
https://www.google.com/search?q=beet+harvest+working
https://www.theunbeetableexperience.com/sugar-beet-harvest-f...
Some places have/had the schools close for the harvest season (and in others, for the start of hunting season).