1/2 cup (1 stick) unsalted butter
3 cups chopped onions (about 1 pound)
2 cups chopped celery (4 to 5 stalks)
1 pound Granny Smith apples (about 2 medium), peeled, cored, cut into 1/2-inch cubes
1/4 cup chopped fresh Italian parsley
2 tablespoons chopped fresh sage
2 tablespoons chopped fresh marjoram
1 cup (or more) low-salt chicken broth
1/2 cup diced dried apricots
1/2 cup dried sweetened cranberries
1/2 cup diced stemmed dried figs
12 cups (generous) 1-inch cubes day-old pain rustique or ciabatta bread with crust (about 1 1/4 pounds)
2 large eggs
1 1/2 teaspoons fine sea salt
1 coarsely ground black pepper