The 70th UN General Assembly's (UNGA) Second Committee (Economic and Financial) will hold its discussion of sustainable development on 19-20 October 2015, per the provisional programme of work (calendar) for the Session.  

dates: 19-20 October 2015  
venue: UN Headquarters  
location: New York City, US  
www: http://www.un.org/en/ga/second/70/calendar.pdf
 https://papersmart.unmeetings.org/ga/second/70th-session/programme/