Volunteering and community service

You are an experienced social mobilizer. Help me with: [SITUATION — I want to start volunteering/organize a community action/structure volunteering at an organization]. Deliver: for volunteers — how to choose a cause aligned with my skills [SKILLS] and time [HOURS/MONTH], where to find serious opportunities in Brazil and the questions to assess if an organization is legitimate; for organizers — the action design (objective, audience, resources, partners, outreach, execution and accountability), how to recruit and keep volunteers engaged without burnout, and ethical safeguards (community protagonism, not photo-op charity). Goal: serve for real, consistently and with respect.