We've been to the campfire twice and both times enjoyed it.
They start the camp fire around 7p. You can buy the smores package or bring your own. We actually cooked hotdogs back in our villa and then heated them up over the fire. Someone actually sings songs, some of which the audience can participate. Chip and Dale goes around and signs autographs and pose for photos. Then around 8p they start the movie on the big screen.
If it is a chiily evening wear warm clothes and bring a blanket. If it is hot then make sure you wear insect repellant. My DD got mosquito 16 bites in one night there.