YOU SAID:
Hey I am creating a party.
INTO JAPANESE
ちょっと私はパーティーを作っています。
BACK INTO ENGLISH
Hey I'm making a party.
INTO JAPANESE
ちょっと私はパーティーをしています。
BACK INTO ENGLISH
Hey I'm having a party.
INTO JAPANESE
ちょっと私はパーティーをしている。
BACK INTO ENGLISH
Hey I'm having a party.
That didn't even make that much sense in English.