Cover corn with water; let stand 30 minutes. Drain. Remove husks from corn; discard husks. Scrub silks from corn; set corn aside.
Place corn on grill rack; cook 25 minutes or until corn is lightly browned, turning every 5 minutes. Cool. Cut kernels from ears of corn to measure 2 cups. Set kernels aside; discard cobs.
Cut bell peppers in half lengthwise; flatten with hand. Discard seeds and membranes. Place bell pepper halves, skin sides down, on grill rack. Cook 20 minutes or until blackened. Place in a zip-top plastic bag; seal. Let stand 15 minutes. Peel and finely chop to measure 3/4 cup.
Combine corn, bell peppers, and remaining ingredients in a medium bowl. Cover and chill.