I think you may be talking about the campfire at Ft Wilderness---Chip and Dale visit, there's a sing a long and then they show a Disney movie. This is outdoors. You can purchase smores kits, from a food cart and troast marshmallows on the fires. But it isn't a cookout in the since of hamburgers, hotdogs, etc.
There is an event called the All American Bar b Q but it has many characters not just Chip & Dale (moreinfo on that on the homepage of the DIS)