You do not need everyone to create a transformative movement. There only so many individuals a person can connect with one-on-one before needing to rely on less personal forms of communication. If you sent out a request for your fans to assemble in a small courtyard, who would show-up? Are they ready for action?
Once you have the group assembled, empower them. Trying to enroll everyone into a call to action is unrealistic. Concentrate of those that have appeared wearing the team colors. It is easy to frete about who is missing but the game goes on with players who wear the uniform.
This is your team!