K. Days of general discussion/thematic debates Some treaty bodies hold days of general discussion on a particular theme of concern to them. These discussions are usually open to external participants, such as United Nations partners, delegations from State parties, NGOs and individual experts. Their outcome may lead the treaty body to draft a new general comment. The Convention on the Rights of the Child provides for its Committee to recommend to the General Assembly that it request the Secretary-General to undertake on its behalf studies on specific issues (art. 45 (c)). So far the Committee has made two such requests: on children and armed conflict and on violence against children. The Secretary-General has issued related studies and the General Assembly subsequently established two mechanisms: the Special Representative of the Secretary-General for children and armed conflict; and the Special Representative of the Secretary-General on Violence against Children. L. Meetings of State parties and meetings with State parties Each treaty (except the International Covenant on Economic, Social and Cultural Rights) provides for a formal meeting of State parties to be held every two years, usually at United Nations Headquarters, in order to elect half the members of the treaty body. The Convention on the Rights of Persons with Disabilities is the first treaty that provides explicitly for such meetings to be held for other purposes, too. The Convention on the Rights of the Child (art. 50), the Convention on the Rights of Persons with Disabilities (art. 47) and the International Convention for the Protection of All Persons from Enforced Disappearance (art. 44) provide for a conference of State parties to be convened to vote on any proposed amendments to their provisions. Most committees also hold regular informal meetings with the State parties to their respective treaties to discuss matters of common concern related to their work and the implementation of the treaties. M.  Coordination among the treaty bodies Annual meeting of chairpersons The General Assembly recognized the need for coordination among the human rights treaty bodies in 1983, when it called on their chairpersons to meet in order to discuss how to enhance their work. The first such meeting 37