You can organize a protest in a public space like a park. You can book a space like a library or a church. You can start mailing lists to organize like-minded people.
The first one sounds like something the government can deny a permit for and the second and third ones wouldn't reach the government at all.
You're entitled to freedom of speech. You're not entitled to an audience.
Think you forgot an entire half an amendment there.
What part did I forget? Nothing in the First Amendment compels other people to listen to your speech.