From WikiPilipinas: The Hip 'n Free Philippine Encyclopedia
Sanduguan is a festival that reenacts the first barter trade between the Mangyan, the natives of Mindoro and traders from China. They celebrate the festival by dancing interpreting the trade with costumes made of anything that can be found in their hometown. Sandugo is the root word of sanduguan which means brotherhood or friend and the trades that happened long time ago was the earliest trade being recorded in the trade history of china which was in 900 AD.
- "Sanduguan", http://www.lutongbahay.com/index.cfm?pagename=focusregion&opn=0&focusID=98 (accessed on September 20, 2007)