The Brazilians are part of a Group Study Exchange (GSE) with Northfield Rotary.
This Rotary blog post from last summer has more details:
Group Study Exchange (GSE) is a unique educational experience that furthers international understanding by providing an opportunity for outstanding business and professional people to study another country, its people, its culture and its institutions. Each GSE team visits a Rotary district in another country for four weeks. Team members stay in the homes of Rotarians, if possible, and follow an itinerary of educational and cultural points of interest. Travel and living expenses are covered during the exchange by The Rotary Foundation, Rotarians and Rotary District 5960.
A Rotary District 5960 GSE team will visit Rotary District 4550 in Bahia, Brazil, from April 8, 2012 – May 5, 2012. The focus of the exchange will be public policy, public health and economic development. Rotary offers this opportunity to spend a month living with local Rotarians and seeing the country in a way few will ever experience.