YOU SAID:
I am secretly going to a party tonight want to come?
INTO JAPANESE
今夜はこっそりパーティーに行きたいの?
BACK INTO ENGLISH
Want to go to a party tonight?
INTO JAPANESE
今夜のパーティーに行きませんか?
BACK INTO ENGLISH
Want to go to the party tonight?
INTO JAPANESE
今夜のパーティーに行きませんか?
BACK INTO ENGLISH
Want to go to the party tonight?
That didn't even make that much sense in English.