YOU SAID:
hey dude you wanna go to my party saturday?
INTO JAPANESE
ねえ、土曜日の私のパーティーに行きませんか?
BACK INTO ENGLISH
Hey, would you like to come to my party on Saturday?
INTO JAPANESE
ねえ、土曜日の私のパーティーに来ませんか?
BACK INTO ENGLISH
Hey, would you like to come to my party on Saturday?
That didn't even make that much sense in English.