Join CAR-PGa (Committee for the Advancement of Role-Playing Games)
If you have ever been an advocate for the adoption and use of role-playing games, you should definitely consider joining this organization. Membership is "free", your "fee" is just that you need to be posting something related to the advocacy of role-playing games to qualify for membership. Check out the website for more information, and definitely consider joining.
If you are a blogger, journalist, or just generally active in promoting the use of tabletop role-playing games, you should definitely join.