Suggestion for setting the meals: Place a mat of some kind on the tray to keep dishes from sliding. Lay only the flatware required for the main course. Tuck the napkin partially under the main plate or flatware.
Use the short tumblers. Cups without saucers may be used for beverages. Bread and butter plates or small bowls for salads may be used. Serve the main course on the smallest plate that will accommodate it. Dessert may be included in the tray.