a day on which the children in a school compete in races, etc. against each other

School sports days often have a parents' race, too. 校运会也经常安排家长赛。

A school has banned the sack race and the three-legged run from sports days - in case the pupils are hurt. 一所学校已经禁止在运动会上举行跳袋比赛和三人腿比赛，以免学生受伤。