To make the dressing, whisk together all the ingredients in a small bowl. Set aside. The dressing may separate later on, if so, just rewhisk until combined.
In a large bowl, add all the vegetables, olives, and feta cheese.
If you're serving the salad immediately, drizzle the dressing over and toss to combine. If you're making ahead of time, refrigerate the salad and dressing separately, then combine them just before serving to keep the vegetables crisp.
Nutrition information is calculated using an ingredient database and should be considered an estimate.