Composed of grassroots advocates around the country willing to write their legislators. It takes you from the simplest to the hardest advocacy. This book provides commentary on current IRS documents. Make them aware of who you are and your existence Find your on going contact person Work those issues you are concerned about that day. There is a lot of competition.
Businesses come in but they are presumed to be self interested.
Museums lack the economic power but they are serving others. Prove you are the good guy. Give concrete examples. This changes your argument from the abstract to practical help for the community. Your board is full of powerful local people.