Heat grill to medium-high.
Drizzle zucchini and corn with olive oil and sprinkle with salt and pepper.
Place corn and zucchini on grill, turning about every 4 minutes to get evenly charred.
Remove corn and zucchini from grill. Cut the kernels from the corn and place in a large bowl. Cut the zucchini into bite-sized pieces and place in bowl with corn.
In a small bowl mix together lime juice, vinegar, honey, salt, pepper, red pepper flakes, and 1 tablespoon olive oil.
Pour dressing over corn and zucchini. Sprinkle with feta cheese.
Can be served warm, room temperature, or chilled.