YOU SAID:
crashing into someones party
INTO JAPANESE
誰かのパーティーに衝突する
BACK INTO ENGLISH
crash into someone's party
INTO JAPANESE
(人)のパーティーに衝突する
BACK INTO ENGLISH
clash with someone's party
INTO JAPANESE
(人)のパーティーと衝突する
BACK INTO ENGLISH
clash with someone's party
Okay, I get it, you like Translation Party.