SETTING UP ON SHABES

Question

ON A RECENT SATURDAY NIGHT I ATTENDED A PARTY IN A LIBERAL ORTHODX SHULS, FEW SHOMER SHABES MEMBERS. THE CHAIRS AND TABLES HAD BEEN SET UP ON SHABBES AFTERNOON. IS THIS ALLOWED? BY A GENTILE, OR BY A JEWw AND IF A GENTILE CAN DO THIS, CAN HE ALSO DO THINGS LIKE CUTTING PAPER FOR DECORATING, TURNING ON ELECTRICITY, BRINGING STUFF IN FROM OUT ON THE STREET CAN THE CATERER SHOW UP WITH GENTILE DRIVERS TO DELIVER THE STUFF ON SHABES i SAW THAT DONE ON BOSTON BY A FRUM CATERER DELIVERED FOR A BIG LUNCH AND CLEANED UP AND TOOK AWAY AND DROVE AWAY SHABBES AFTERNOON. SO CAN YOU SET UP A DINING ROOM SN SHABBES FOR AFTER SHABBES,,,JEW GENTILE??ETC