YOU SAID:

Hey guys, are you in for a party?

INTO JAPANESE

ねえ、あなたはパーティーのためにいるの？

BACK INTO ENGLISH

Hey, are you going for a party?

INTO JAPANESE

ねえ、パーティーに行くの？

BACK INTO ENGLISH

Hey, are you going to the party?

INTO JAPANESE

パーティー行く予定？

BACK INTO ENGLISH

You going to the party?

INTO JAPANESE

パーティー行く予定？

BACK INTO ENGLISH

You going to the party?