If you know your relays, baton changing is a top lesson. High jump - they love the fozz. Wouldn't go for anything above 60m unless you are doing a starts - pick up - maintain - for a 100m. I know I haven't offered any depth, just what I know gets the class involved and interested quickly. Whether you know your stuff or not, they will be looking at delivery, your enthusiasm and your class control. Hammer and Pole Vault are 'no nos'.