The Sing-Along is at Fort Wilderness Campgrounds. It is free to everyone. The Sing-Along starts at 7pm and the movie is at 7:40pm. It is located behind the Meadow Trading Post (near Pioneer Hall...where the Hoop Dee Doo is). Here is the write up on it :
Kids of all ages are invited to come and sing all their favorite campfire songs with our nutty friends, Chip 'N' Dale. Located behind the Meadow Trading Post, our theater under the stars is a fabulous place to get into that "Disney Spirit" while roastin marshmallows. Stay after the show and watch classic Disney movies starting at 7:40pm. In the event of inclement weather, a "Porch Jam" sing-a-long will take place at the Ol' Meadow Swimmin' Hole. Movie and Sing-a-Long are free of charge. Chuckwagon Fixin's 'n Such offers pizza, hot dogs, nachos, snacks, marshmallows, beverages, and ice cream.