It's been awhile since I've been up near Bradley Airport (which is in Windsor Locks, not Hartford), but there wasn't anything too exciting that I ever saw. Not much in between the airport and Middletown that's near the highway. Look for threads on Middletown, there's lots of places there as brookerme suggested.
Heading down 91 towards Middletown, thai restaurant
Wethersfield/Rocky Hill exit down the Silas Deane. Then you can hop back on the highway to 91/Route 9 to get to Middletown.
There's plenty of places to eat in Middletown while you are at the conference.
Very casual, great food.