I called Fort Wilderness directly and they gave me the time and what movie was playing for the night I was interested it. It begins with a sing-a-long with Chip and Dale. There are phot ops was Chip and Dale walk around afterwards. They show a Disney movie. Anytime during the sing-a-long till the fires die down, you can roast your marshmellows. The have a stand where you can buy your supplies along with other movie goodies.
The campfire is held nightly in the center of the campground near the Meadow trading post area. You can easily take a bus from WL, the bus stops at the trading post. Marshmellows are sold there. Chip and Dale lead a sing along and then it is followed by a Disney movie. A rarity at wdw it is Free!!!
The FW Campfire is a blast. Like stated it is behind the Meadows Trading Post. Starts at 7:00 PM unless rain and there is the Chuckwagon where you can buy a bag of Smore fixins with two sticks for 5.00. They also have Hot Dogs, Popcorn and the usual fare.
There are two campfires where you can fix your Smores. There is a Gal that is a hoot to lead the Sing-a-Long and Chip N dale make the rounds. Then a Disney classic cartoon and then a Disney Movie. There are bleachers or you can take a chair or blanket.