sports day 
noun British
An occasion on which the pupils of a school compete in various races and athletic events.Table tennis and badminton were also played and we had swimming and athletic sports days....
- Children's outdoor school activities, like sports days and outings, can now be called off if the wicked sun is out.
- Throughout Sunday, we watched these superb athletes striving to achieve their best, and I remembered sports days past at my kids' schools.