I am assuming you are teaching FMQ on a DSM...
setting up your space. (table to the left and behind your sewing table to deal with weight of quilt.
trying different darning feet (open vs. closed, hopping vs. not hopping)
using different thread,
using machingers
basting spray vs. pinning (large pins vs small pins), when to remove pins
different methods for marking the quilt
what needle to use in the machine
If you want to imress the class, have multiple pictures and very short films demonstrating different techniques. Discuss specific brands and how/where to purchase. Make it easy on people to try new techniques and products.
perhaps ask people to show up with a specified number of blocks that are pinned (tell them to use their ugly fabric) to practice on during the class. Once people try, they will have questions.
It would be kinda fun if you had a few fat quarters to give away as prizes during class for things like...
first person to stump you with a question, first person to "travel" correctly, answering multiple choice questions about FMQ. Makes it more interactive which makes it more fun.
Have people choose from a book of pictures of techniques a specific pattern that they want demonstrated.
I wished I lived closer. I am determined to develop great FMQ techniques