At a Headquarters press conference today, to announce the annual Treaty Event taking place at Headquarters from 23 to 25 and 28 to 29 September on the margins of the high-level segment of the General Assembly’s general debate, the United Nations Under-Secretary-General for Legal Affairs and Legal Counsel, Patricia O’Brien, said the Optional Protocol to the 1966 International Covenant on Economic, Social and Cultural Rights would be a highlight of the wide range of featured treaties.