In the last two years, I teached at the Universidade Federal do Rio de Janeiro (UNIRIO). It is a federal university. But my link as teacher was tied to my master's degree. At the end of 2009, I finished my master's degree and, consequently, my relationship as a teacher.
Could I help it anyway? What kind of communication is that?
How many students are in this group? When they arrive at Rio de Janeiro?
I'd love to correspond with these students or have dinner with them. But if you're looking for a professional service (logistics, transportation, official relationship with Brazilian universities or hosting) I suggest you contact some institutions. Tell me more about this "Spring Break Project" and I think how can I help you...