Heidi ran to meet him, confusedly telling him of the great event.

海蒂跑过去迎接他，慌乱地想告诉他这件大事。

All his friends and schoolmates must be invited to celebrate the great event!

他一定要邀请所有他的朋友和同学来庆祝这个重大的事情！

I'm sure it'll be a great event.

我肯定这将是个重大的事件- and great for China。

And what great event happened in 1812?

那么1812年发生了什么重要事件呢？

I think the marathon will be a great event.

我想马拉松比赛将会是个令人瞩目的大事件。