Not sure, depends on when you're going. We just got back and were at the campfire on Friday night. We got there about 6:45 and Chip n Dale had walked around a bit after the campfire lighting.
At 7:00 Chuckwagon Bill or something like that is his name (LOL I can't remember!) got on stage and started the sing a long with Chip n Dale. They then made the rounds around 7:15-7:20. We only saw Dale so they were pretty quick. By 7:45 they started the movie. I believe they may do this a little later after the time change to daylight savings time, but not sure.
You will also need to take a bus from the Settlement Post where the HDDR/Pioneer Hall is to the Meadow area unless you're staying on the grounds and have a golf cart or a bike so you'll need to allow that travel time as well (which shouldn't be too long).