Strive to get the name out to attract attention. Strive to keep your group interested in gaming. But once that time has passed, make sure to bring that person back into the fold. Keep your group strong. Actively recruit new members.
Growth is a key, especially since many members come and go over time.
Running pick-up games are great, but consider taking the games to the next level. The Ocala Garrison is writing it's own Seven Years War system. The Gainesville Garrison ran a great AK-47 campaign and is in the middle of a Warmaster campaign. These types of games take a bit of work to setup, but they bring a lot of fun to the group. Most Garrison areas have a game store of some sort who might be interested in new business from a serious group of gamers.