YOU SAID:

To come unannounced to a party

INTO JAPANESE

予告なしにパーティーに来る

BACK INTO ENGLISH

Come to the party without notice

INTO JAPANESE

予告なしにパーティーに来てください

BACK INTO ENGLISH

Please come to the party without notice

INTO JAPANESE

予告なしにパーティーに来てください

BACK INTO ENGLISH

Please come to the party without notice