Watch Free Online HD Moviesjoy. The Rock in Rio USA Festival will take place over two weeks in May with designated rock and pop weekends. The rock weekend will take place May 8 and May 9 in Las Vegas. For those looking for a harder edge, May 9 has Metallica, Linkin Park, Rise Against, Hollywood Undead, Deftones, Sepultura, Coheed & Cambria and Of Mice & Men all part of the lineup.