There's no denying that a child's education is important, but sometimes, there is an event that will lead to a lifetime memory that is worth missing a random Tuesday of school for.
Sports may be games, but a championship celebration doesn't happen every year in most cities. Just look at Kansas City last year. Back in November, some Kansas City-area schools recognized that and gave students and faculty a day off so they could celebrate the Royals' first World Series title in 30 years at the victory parade.
Those schools realized they were going to have an enormous amount of absences, so they just closed for the day.