1) if you have friends in São Paulo ask them to buy a ticket for you
2) find someone that speaks Portuguese and spend around 15 minutes on an international phone call to "Ingresso Rapido" at +55-11-4003-1212
3) once you arrive to São Paulo, run to a point of sale and hope there are still tickets left
If you tried to purchase the ticket using the advertised website www.ingressorapido.com.br, you will quickly find out you are only able to register if you have a Brazilian address. I tried to contact "The Week" regarding this issue, but unfortunately got no response from them. Therefore I called "Ingresso Rapido" and they told you could buy the tickets via telephone, just make sure your credit card company does not block the purchase coming from Brazil.
Due to the fact The Week International is becoming a very well known place around the world, they should start thinking about all those "organized" foreigners coming to party at their backyard. Keep you posted about the party on May 24 (R$ 80.00), if I have time I will post the review shortly after, otherwise until I return to Montreal.