YOU SAID:

there's a party going on at mine tonight, why don't you come it would be nice if you did

INTO JAPANESE

今夜私でパーティーが行われているので、来てみませんか？

BACK INTO ENGLISH

I'm having a party tonight, so why don't you come?

INTO JAPANESE

今夜パーティーをしているので、来てみませんか？

BACK INTO ENGLISH

We're having a party tonight, so why don't you come?

INTO JAPANESE

今夜はパーティーですので、是非お越しください。

BACK INTO ENGLISH

It's a party tonight, so please come visit us.

INTO JAPANESE

今夜はパーティーですので、ぜひお越しください。

BACK INTO ENGLISH

It's a party tonight, so please come visit us.