Brazil adopts a policy of reciprocity regarding visas. This means that nationals of countries that require visas for Brazilian citizens will need a visa to travel to Brazil. The country has signed visa exemption agreements with about 90 countries. Please check in this link whether you need to apply for a visa to enter Brazil.
If you need a visa and need to receive an invitation letter to present to Brazilian authorities in your country, please visit the link: VISA FORM
Nationals of Australia, Canada, Japan and USA can apply for a visa through an on-line service. This is a much faster way to get the visa, but unfortunately, at the moment, it is available only for nationals of those four countries: http://www.vfsglobal.com/brazil-evisa/
We look forward to seeing you in Foz do Iguaçu!
The Organizers of ICC7