Juneteenth is usually celebrated in the USA on June 19th to commemmorate the end of slavery, and it is also known as "Emancipation Day". It is not an official federal holiday, but is a very important day nonetheless.
Read more about Juneteenth:
http://specials.msn.com/Juneteenth-Cele ... >1=36010
http://en.wikipedia.org/wiki/Juneteenth
Senate passes resolution:
http://www.washingtonpost.com/wp-dyn/co ... eheadlines