bigedmustafa had some great advise.

If you want to keep your field, show the city counsel that your club is an asset to the community - FIRST by forming a club. Keep the non-AMA members out. Now I am not a big proponent of the AMA, but when you're dealing with politicians, showing them that you are responsible (By belonging to a nation-wide organization AND having insurance) goes a long way.

Aside from big Ed's suggestions, talk to your local schools about giving lectures on basic aerodynamics. The kids love it, the club members love it, and it's one more feather in your cap if and when you are confronted by the city.