I thought most schools were mandated to have school for 180 days - unfortunately, a "day" can even be considered 1 hour. Many of the days off are institute days/or workshop days for teachers, however, schools have become smarter as to when they plan those days because many families take them off anyway because they extend vacations around Memorial Day, Columbus Day, and Veterans Day. This year, our kids get off the entire week of Thanksgiving because of the holiday and Parent/Teacher conferences. A couple years ago, our kids had off the ENTIRE Veterans day/week of November. They had 10 days IN A ROW, including the 2 weekends and a 1/2 day the previous Friday - PLUS they had off the two days for Thanksgiving, just two weeks later. I think many parents went ballistic and it has since been changed.
Usually, on those days off or weeks off, your community park district should have camps or programs, available to children and for parents who need to make sure their child has supervised, fun activities during the week.