The Organization of American States (OAS)
The Inter-American Court of Human Rights (IACHR)
and The Summit of the Americas
THE ORGANIZATION OF AMERICAN STATES
The Organization of American States is the world's oldest regional organization, dating back to the First International Conference of American States in Washington D.C., beginning in 1889.  Since then, the OAS has functioned as the premier international organization for the Western Hemisphere, acting as a "United Nations" for the countries of North, Central, and South America and the Caribbean.  The organization became known as the Organization of American States after the signing of the OAS Charter in 1948 in Bogota, Colombia.  The charter entered into force in 1951, and has since been amended in 1967, 1970, 1985, 1992, and 1993.
The OAS is comprised of 35 member states and has granted permanent observer status to 59 others, as well as the European Union.  The essential purposes of the OAS are: to strengthen peace and security in the hemisphere; to promote and consolidate representative democracy, with due respect for the principle of nonintervention; to prevent possible causes of difficulties and to ensure peaceful settlement of disputes that may arise among the member states; to provide for common action on the part of those states in the event of aggression; to seek the solution of political, juridical, and economic problems that may arise among them; to promote, through cooperative action, their economic, social, and cultural development; and to achieve an effective limitation of conventional weapons that will make it possible to devote the largest amount of resources to the economic and social development of the member states.
The member states of the OAS are: Antigua & Barbuda, Argentina, the Bahamas, Barbados, Belize, Bolivia, Brazil, Canada, Chile, Colombia, Costa Rica, Cuba, Dominica, the Dominican Republic, Ecuador, El Salvador, Grenada, Guatemala, Guyana, Haiti, Honduras, Jamaica, Mexico, Nicaragua, Panama, Paraguay, Peru, Saint Kitts & Nevis, Saint Lucia, Saint Vincent & the Grenadines, Suriname, Trinidad & Tobago, the United States of America, Uruguay, and Venezuela. 
THE SUMMIT OF THE AMERICAS
In the Summit of the Americas Organizations' own words, "the Summits of the Americas are institutionalized gatherings of the heads of state and government of the Western Hemisphere where leaders discuss common policy issues, affirm shared values and commit to concerted actions at the national and regional level to address continuing and new challenges faced in the Americas. The Seventh Summit of the Americas was held in Panama City, Panama on April 10-11, 2015.Peru will host the Eighth Summit of the Americas in 2018."

Unlike meetings of the UN or OAS, the Summit of the Americas is comprised almost entirely of heads of state.  As such, the ESMOAS General Committee emulates this meeting, while the other committees emulate actual OAS committees who meet regularly.

Though not administered directly by the OAS, the Summit of the Americas organization is closely linked with its representatives and missions.
THE INTER-AMERICAN COURT OF HUMAN RIGHTS
The IACHR was established in 1979 by the OAS to help enforce the American Convention on Human Rights.  It hears and rules on cases of human rights violations within the hemisphere, and issues opinions on matters of legal interpretation.   Member states voluntarily submit to the court's jurisdiction, and are  brought before the IACHR by "petitioners," or people who feel their human rights have been abused or violated.

The IACHR Moot Court Competition emulates the proceedings of the actual IACHR, and uses a similar format.  First, written memorials are submitted to the court on behalf of both the state and petitioner.  Second, oral arguments for both sides are heard, and a judgment is rendered.