If your club or group is looking for a public speaker, I'm happy to discuss such arrangements.  Usually it is best to plan a few months in advance to adequately publicize the event and ensure it is well-attended. I've been speaking to clubs for the past five years, and at national conferences like MACNA, MAX, and Reefapalooza.  The talks are designed to be dynamic, keeping everyone interested from seasoned hobbyist to the spouse of a newbie. :)