The bad weather spoiled Sports Day, which we had really been looking forward to.
I hope it’s sunny on the day of the sports festival.
We were surprised that on the morning of Sports Day, there were parents asking if we could change it to tomorrow just because they couldn't make it that day.
Remember how 運動 means "exercise?" When you meet with a bunch of other people to exercise it's called Sports Day! This is a day at schools in Japan where everybody does physical stuff together! It's fun and also very tiring!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.