Let's have a class party.

让我们举行一场班级聚会。

Let's have a class party this Saturday!

这周六，让我们来举行一个班级晚会吧！

It's a class party.

是班级聚会。

Two hours ago you went to attend the class party in high spirits.

两个小时之前你欢欢喜喜的出去参加同学聚会了啊。

Thanks for agreeing with me about the class party; you are a girl after my own heart.

感谢您对班级舞会的想法与我一致，您是位令人愉悦的女孩。