Yes there is a big bus stop up near the check-in area of the Fort where you can get a ride to DTD, the theme parks, etc.. There is also a big bus stop down near Pioneer Hall/Hoop Dee Doo/Marina to get busses to Wilderness Lodge, the Contemporary, and resorts around Bay Lake.
Finally boats run from the Fort Marina to Wilderness Lodge, the Contemporary, and the Magic Kindgom. The campfire/movie probably last at most about 2.5 hrs (depending on movie length) and even if it's on a night when the MK closes early (say 9 pm) the transport system will get you back where you need to go.
Enjoy!
Bama ED