Here are two sites that are updating regularly with infos around the anti-World Cup, anti-FIFA protests in Brazil. You can see that there are a lot of non-demonstration stuff happening such as massive projections of anti-FIFA images in the downtown of Rio as well as other interventions.
Limehouse Town Hall
Seymour Wright + TBC
Ute Kangiesser - Solo Cello
Design A Wave
Anthony Iles + Marina Vishmidt (DJ)
Mike Levitt + James Janco (Limazulu) (DJ)