Here's a simple version of grilled corn – figure on two ears per person.
Fresh corn on the cob
Canned chipotles (smoked chilis) in oil, or chili flavored with other oil
Salt to taste
Pull back corn husks without pulling them off, and remove cornsilk. Combine butter with a little chipotle oil and salt. Using a pastry brush, a spoon or your fingers, coat each ear of corn with some oil, then replace husks. Place the ears of corn around the edge of the BBQ, and turn often to warm them through.