YOU SAID:

we're going to the party where there will be lots of fun girls

INTO JAPANESE

楽しい女の子がたくさんいるパーティーに行きます

BACK INTO ENGLISH

Go to a party with lots of fun girls

INTO JAPANESE

楽しい女の子がたくさんいるパーティーに行く

BACK INTO ENGLISH

Go to a party with lots of fun girls