Places where you can locate Conferences and Information in the field of Third Sector: 

http://philanthropy.com/events   
http://www.allianceonline.org/calendar  
http://www.ahrmio.org   
http://www.arnova.org/calendar.php   
http://www.istr.org/news/announce.htm  
http://www.independentsector/org/members/events.asp    


Search engines conferences: 

http://www.allconferences.com 
http://www.conferencealerts.com  


World Social Forum: 

http://www2.forumsocialmundial.org.br/dinamic.php?pagina=foruns_nacionais_eng 


Researchers organizations always have annual conferences or bi-annual, and are usually open to all relevant issues sector: 

http://meetings.aomonline.org 
http://www.arnova.org  
http://www.istr.org