YOU SAID:

You gotta go to this party dude,

INTO JAPANESE

あなたはこのパーティーの男に行って、

BACK INTO ENGLISH

You went to the man at this party,

INTO JAPANESE

あなたはこのパーティーで男に行った。

BACK INTO ENGLISH

You went to a man at this party.

INTO JAPANESE

あなたはこのパーティーで男に行った。

BACK INTO ENGLISH

You went to a man at this party.