Here are some sites of possible general interest:
http://www.latino.si.edu
(not all information is current)
http://www.folkways.si.edu/projects_initiatives/latino_english/home.html
http://www.folklife.si.edu/index.html
(of interest if you plan to be in Washington, DC June 30-July4, and July 7-11; updated details to be posted in May)
www.mfacmchicago.org (read about exhibit of African presence in Mexico from Yango to present)

Have a good week.
Natalie in VA