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A woman rides a zipline at the City of Rock on the first day of "Rock in Rio", in Rio de Janeiro, Brazil, on September 15, 2017.
Running for seven days in all -- Friday through Sunday and then September 21 to 24 -- Rock in Rio is being welcomed by the city as a chance to put the huge facilities built for the 2016 Olympic Games back in use. They have hosted only sporadic events since the Olympics ended in August of that year. While Brazil is only starting to emerge from a painful recession, the 700,000 tickets to the event sold out months ago and city hotels are hoping to be nearly full, reversing a prolonged post-Olympic slump. / AFP PHOTO / Apu Gomes        (Photo credit should read APU GOMES/AFP/Getty Images)
A woman rides a zipline at the City of Rock on the first day of "Rock in Rio", in Rio de Janeiro, Brazil, on September 15, 2017.
Running for seven days in all -- Friday through Sunday and then September 21 to 24 -- Rock in Rio is being welcomed by the city as a chance to put the huge facilities built for the 2016 Olympic Games back in use. They have hosted only sporadic events since the Olympics ended in August of that year. While Brazil is only starting to emerge from a painful recession, the 700,000 tickets to the event sold out months ago and city hotels are hoping to be nearly full, reversing a prolonged post-Olympic slump. / AFP PHOTO / Apu Gomes        (Photo credit should read APU GOMES/AFP/Getty Images)

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