How events like world cup and ollympic games can help to change the Brazil's realty?

The intense work of preparation will move the economy and generate employment.
Great opportunity to bring significant improvements to city of  Rio de Janeiro, to development of Brazilian tourism, toincrease the foreign currency of Brazil on the globalized world, to enlarge economy, to entrepreneurs increase their business, to that nwe companies arise, to more employment be generated.
Brazil need more infrastructure to support the great demand of tourism, more police to avoid violence with the tourists.