Mince garlic cloves in a food processor. Add capers; pulse to chop. Add olives, vinegar, and oregano; pulse to chop again. Turn into a medium bowl; stir in olive oil and celery. (Can be refrigerated in an airtight container for several weeks.) Serve on crackers with other appetizers.
Recipe by Three Many Cooks at https://threemanycooks.com/recipes/nibbles-and-apps/mixed-olive-salad/