Looking to meet recently arrived immigrants in São Paulo

Hello, my name is Walker Dawson and I'm a documentary filmmaker from California. I used to live in Brazil many years ago and I'm coming back now to do a short thesis film on contemporary African and Asian migration to São Paulo. Is there any chance people here can help direct me to anyone who can speak about this more or any contacts within those communities?

Thanks again!

Asian: 
Koreans on Bom Retiro ( Garment District )
Chinese on Aclimação, Cambuci, and now, I am told on Belém ( Sâo Paulo ). They are also taking over Japan Town ( Liberdade ), and Bom Retiro.   

Africans:
Santa Ifigênia, Brás, República, Glicério( Sé ),

Brás, Pari, Catumbi,  in particular are  going to give you all you need in terms of seeing first hand emigrees.  It is an emigree gateway locale.

Also wander through Rua 23 de Março, Sé, Rua Florêncio de Abreu, and you will score a boat load of all of them.