Combine the yogurt, mayonnaise and pesto in a medium bowl. Mix in remaining ingredients. Cover and refrigerate until needed. Can be made a day in advance of serving. When needed, transfer to a decorative bowl, set on a platter and surround with things such as sliced, toasted baguette, crackers or wedges of pita.
Note: Roasted red peppers are sold in jars in the pickle aisle.