If you're in school try starting a club. Put up signs. You can put free community ads in your local paper advising people of when and where you're going to meet. Colleges and YMCA and libraries can also help. You could contact your local paper and TV for free publicity once you have a time and place. Good luck. Glad some people are trying to stop bullying.
Face to Face. Ask people if they have been bullied. If they say yes, ask them to join the club. Tell them you will only ask them once, and if they don't join "right now", they can join any time that they feel comfortable. Then, don't ask them again, it might be bullying.