To cover the Olympics, during the month of August and September, non-Brazilian Amateur / Ham Radio operators will be able to operate in Brazil, regardless of a reciprocal agreement.

An agreement has been reached with ANATEL, the Brazilian Telecommunications regulator, to allow operations without a fee.

To operate, you must gain authorisation from LABRE, the local society, to gain this, the following must be provided

A copy of a valid passport (identification pages)
A copy of the applicant's Amateur Radio license
A list of cities in which the radio amateur plans to operate and the respective dates
An e-mail address

More Information - http://www.arrl.org/news/brazil-eases-authorization-for-radio-amateurs-attending-the-2016-summer-olympics