Ask your local drama school to lend you some students for your course. In return you can teach them first aid or agree to support their next show. Brief the actors on what you will be teaching each lesson so that they can act out a scenario for your students.
Teach the theory of the first aid skill on the day's agenda. The actors can now act out a scene where the new skill is required. Use props or fake blood to make the scene more realistic. Allow other actors to cause chaos by screaming or panicking or generally getting in the way.
Delegate one or two students to deal with the crisis. Ask the others to write down what they do. Allow the students to carry out as much first aid as is safe, such as moving the patient to the recovery position and checking the airway. Watch while they apply dressings and bandages if necessary.
Keep the actors in character while you check what has been done. Has anyone called for an ambulance or police if necessary? Ask the watching students to compile a checklist of what has and has not been completed. Is the patient now fit to go home, or will she need further treatment? Do the other actors need any help if they have become hysterical or fainted?
Give the actors a round of applause and ask them what else could have been done. Did the first aider speak to the injured person and reassure her that he was trained? Did the others feel that the first aider was competent? If not, why not?
Take photographs of the actors in character. Ask the students to recap what they have learned. Let the actors clean up. Use the images and students' own checklist and recap notes for a reminder handout at the next class.