Here's an idea for a demo: Four Fast Flying Geese. Make a sample of each step of the process and attach to a small board (your visual aide) and talk through the steps. Provide a handout with info for various sizes.
http://blog.shopmartingale.com/quilt...-flying-geese/
Fast & Furious is #3. Make a copy of the chart as a handout.
At my guild we call these School house minutes.
Jane