The campfire is at 8 p.m. until the time change at the end of October (unless something has change very recently) so you would have time after the 5 pm HDDR. If you are going after the time change it might be a bit of a stretch to see the characters but you could catch the movie.
Sure you can make smores--they sell the fixings at the Chuckwagon or the trading posts or you can take your own.
Have fun!