Country people like to help themselves to mixed fruit salads. Bowls of it frequently make the rounds at the table. One favored make-ahead is the old-fashioned Overnight Salad, luscious with whipped cream. Another example is Glazed Fruit Salad, which contains no fat. Canned apricot pie filling provides the glaze. The flavors of fruits in these salads blend and mellow during the night while the hostess rests so she will be in good form next day while preparing the remainder of the party food.