In a medium size bowl, add olives and feta along with any marinade that has collected in container. Add tomatoes, onion, oregano, lemon juice, olive oil and parsley. Toss gently.
Cook pasta according to package directions
Drain pasta and rinse lightly, draining a second time. Add pasta to bowl with other ingredients. Using a large spoon, mix to coat pasta with marinade. Taste, then adjust seasoning with salt and pepper.
Serve immediately. If storing in refrigerator, let salad come to room temperature before serving.