26-Apr-2016.- On 14 February 2017, the Treaty for the Prohibition of Nuclear Weapons in Latin America and the Caribbean – Treaty of Tlatelolco – will fulfill 50 years of existence. As part of the commemorations of the Anniversary, OPANAL opens the call for a poster contest. The winning poster, besides being the official image of the commemorative events of the 50th Anniversary, will be disseminated among the 33 Member States of OPANAL and it will be printed on a commemorative ticket of the Lotería Nacional Mexicana and the Sistema Colectivo del Metro of Mexico City.