Hi Leslie,
I agree with the School Board and PTA suggestion. I think you'd have better luck with them. You could also try sending letters to your local pediatricians office. Do you have a leave behind (brochure) that the parents could read see while they sit in the waiting rooms? You could also approach your local Girl Scout and Boy Scout office and see if you could do a brief presentation to the parents at a troop meeting. You could also approach the local Boys and Girls Club, martial arts studios that offer classes to children. You could also see if your local library will let you leave some brochures with them.

Hope that helps and if I can be of any more help.

Lea