In a mixing bowl, whisk together plain Greek yogurt, mayonnaise, red wine vinegar, agave, salt and red onion.
Place cooked pasta and chopped broccoli in a large mixing bowl and pour Greek yogurt mixture over top and toss to evenly coat.
Cover bowl with lid or plastic wrap, transfer to refrigerator and chill 2 hours. Toss in chopped grapes, toasted pecans and cooked bacon just before serving.