Hold informative special events, even if it is with a small group. Consider a speaker or show DVDs that are designed to inform others.
Approach other groups but realize that most national and international organizations such as the Chamber of Commerce, Rotary Club, National Farm Bureaus, etc. advance Agenda 21 principles. Truly grass-roots organizations will be your best avenues for success.
Attend City Council meetings, school boards, County Commissioner meetings, etc… and speak up. Even if the officials do not react favorably, your message will be heard by the audience. If broadcast by TV or internet then a broader public audience will also hear the message. Your important statements and documents should become part of the public record.