I'm having a party.

我要办个舞会。

Will you come to the party?

请来参加我的舞会好吗？

I invited them to the party.

我邀请他们来参加我的舞会。

I am not invited.

我没有被邀请。

I have something on.

我有事。

I'm afraid I can't make it.

我恐怕不行。

Thanks for inviting me.

谢谢你邀请我。

Drop by if you can.

如果方便就过来看看。

Want me to bring anything?

需要我带点什么过去吗？

Just bring yourself.

带你的人就好！/带上你自己就好！寥焀栀崀