A series of school events such as a school picnic and a sports festival give children a chance to learn how to behave in a group. 遠足や運動会など一連の学校行事は、子どもたちにとって、団体行動の仕方を学ぶ機会だ。
To learn is to add to one's knowledge or information: to learn a language. To ascertain is to verify facts by inquiry or analysis: to ascertain the truth about an event.