Pull husks down and remove silk from corn. Soak corn in cool water for 10 minutes.
Place shrimp on metal skewers. Combine olive oil, cumin, garlic powder, and chipotle chile powder. Brush shrimp with olive oil mixture, cover with plastic wrap, and refrigerate.
Heat grill to MEDIUM. Drain corn and place on grill and cook for 15-20 minutes, rotating every 5 minutes until done. Remove from heat and allow to cool before cutting kernels off cob.
Turn grill to HIGH. Cook shrimp for 4 minutes on one side until lightly charred. Flip and cook for an additional 2 minutes or until no longer opaque. Remove from heat.
Assemble salad: Place lettuce in bowl or on plate. Top with roasted corn, black beans, tomatoes, cheese, shrimp, and dressing.
To make Avocado Cilantro Dressing
Combine ingredients in blender and process until smooth. Add up to 1/2 cup additional water if needed to desired consistency.