The UN organizes International Day of the World's Indigenous Peoples annually. The theme of the 2015 event is, 'Indigenous Peoples as Custodians of the Land and its Ecosystems'.  

date: 10 August 2015  
location: US (worldwide)  
contact: Secretariat of the Permanent Forum on Indigenous Issues  
e-mail: indigenous_un@un.org  
www: http://undesadspd.org/IndigenousPeoples/InternationalDay/2015.aspx
 http://www.unccd.int/en/media-center/Pages/CalendarDetail.aspx?calID=262