Pressed Italian Picnic Sandwich with Olive Relish

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1 small celery rib, finely chopped

1 small clove garlic, finely grated

1 cup pitted olives, preferably a mix of colors, chopped

1 tablespoon chopped flat-leaf parsley

1 tablespoon olive oil

1/4 teaspoon Italian seasoning

1 large loaf ciabatta, split horizontally

1/2 pound sliced provolone

2 to 3 ounces thinly sliced Genoa salami

2 to 3 ounces thinly sliced roasted turkey

2 to 3 ounces thinly sliced ham

2 to 3 ounces thinly sliced mortadella