Spray 12x9-inch sheet of foil with nonstick cooking spray. In large bowl, combine tomatoes, gravy and sugar; mix well. Add frozen ravioli, frozen meatballs and mixed vegetables; mix well. Spoon into ungreased 11x8-inch (2-quart) glass baking dish. Cover with foil, sprayed side down; refrigerate at least 8 hours or overnight.
Heat oven to 350°F. Bake covered for 40 minutes.
Uncover baking dish; sprinkle cheese evenly over top. Bake uncovered an additional 10 to 15 minutes or until bubbly and thoroughly heated.