What are some good ideas for ground school subjects at Flight Clinics
Safety ;D
AOPA Safety briefings are always handy and easy to administer. They have some nice ones that are sort of cross-overs between procedural reminders and safety briefings, like the one on Uncontrolled Airports, etc.
When I worked at a local flight school we used to do Night Flying Clinics. They were a big hit with the local pilots, all of them would come out to the school to get a quick hour ground school refresher on night flying knowledge and procedures and then go up with an instructor. I have noticed that a lot of pilots that are in my squadron are itching to get night current. This might be a fun and educational thing to do.
Also don't forget AOPA Safety foundation has those seminar-in-a-box programs on almost all of their safety seminars. http://www.aopa.org/asf/seminars/sib.html. All you do is pay the $24.95 shipping costs.