There are many international volunteer organizations that range from university-run programs in the United States, volunteering and tourism, to United Nations projects.
The support of voluntary native people of the NGO 'Voluntariado África' allowed Calvo to establish links with the people and appreciate the cultural impact of a territory different from the western mindset.
The International Volunteer Day is a good opportunity to give a voice to people who have committed to social projects to improve an environment where society does not manage to do so.