When in a pinch, corn in the microwave can turn out pretty good. I know it's not the same as on the grill, but depending on how full the grill is, it works well enough.
Keep the husk on and do a few minutes, rotate and do a few more minutes. 3/3 is good for 2 ears, 4/4 is good for 3-4 ears, etc.
Enjoy the good eating for a few weeks off and on! I love to grill up a ton of food on the weekend so I have good grab and go food for my lunches during the week that don't require a bunch of time in the morning putting it together.