As far as I've been told, Sport's day in a country-wide occurrence where every single elementary school shuts down for a day of games and activities. It's a complete blast and the students really enjoy themselves for it, but it's set up a tad bit differently from field day back home. For sport's day, the entire school is divided into two teams, the white team and the blue team. Each grade gets to compete in one race and one game, earning points for their team as they go.
The first game up was the 2nd graders, and they played what can only be described as... well, i'm not exactly sure, but here's a video.