To prepare grilled vegetables, combine first 5 ingredients in a zip-top plastic bag; seal and marinate in refrigerator 2 hours, turning bag occasionally.
Remove vegetables from plastic bag; place vegetables on grill rack coated with cooking spray. Grill 5 minutes on each side or until vegetables are tender.
To prepare olive salad, combine the tomato and next 5 ingredients (tomato through black pepper).
Hollow out bottom half of bread, leaving a 1-inch-thick shell; reserve torn bread for another use. Arrange cheese in bottom half of the bread. Top with salami, grilled vegetables, olive salad, and top half of bread. Wrap loaf with plastic wrap; refrigerate up to 24 hours. Cut into 4 pieces just before serving.