I went to Feira da Kantuta in the morning – a Bolivian street market. Bolivians are a recent flow of immigrants, and many in the community are undocumented (with approximately 200,000 working illegally in Sao Paulo).
The market sold everything from toothpaste, clothes, toys, dried food, and a row of restaurants boasting Bolivian fare. They even offered haircuts in tents under the trees! Men: 8 reals. Women: 15 reals.
Children walked around happily with balloons (and cute new haircuts), adults chatted, and people ambled around to get their household needs. It seemed like a social and shopping venue for the community.
I have the phone numbers for one of the restaurants which could be worth chasing down.