Preheat An Outdoor Grill For High Heat. Place The Mushrooms, Zucchini, Squash, Broccoli, And Onion In A Grill Pan, And Brush With 2 Tablespoons Olive Oil. Cook On Preheated, Covered Grill Until Tender When Pierced With A Fork, About 5 Minutes. Remove From Grill And Set Aside. Roll Out Pizza Dough On A Floured Surface To Make Two 8 Inch Circles 1/4 Inch Thick. Place Onto Pizza Pans. Brush Tops With Remaining 1 Tablespoon Olive Oil. Bake On Preheated, Covered Grill Until Browned, Turning Once, About 3 Minutes Each Side. Remove From Grill And Spread With Pesto. Top With Cooked Vegetables. Sprinkle With Blue And Fontina Cheeses. Return To Grill, Cover, And Cook Until Cheese Melts, About 3 Minutes.