Intermediate/advanced Portuguese Group? (São Paulo)

Hello all! I've been working for an NGO here in SP for about 6 months and it's become obvious that if I want more responsibilities at my job, I need to speak and write Portuguese better. Would anyone be interested in starting a relaxed, bi-weekly Portuguese lesson group? I was thinking that we could hire a Portuguese major from USP or some other well recognized university, which my Brazilian boyfriend thinks should be easy enough and is willing to find for us. "Lessons" could be held at my apartment (Jardim Paulista) or at any other participant's apartment after hours (sometime between 6 and 8pm) and cover auditory and reading comprehension, conversation and hopefully a writing component (and maybe some wine). I'm totally open to suggestions and just seeing if there is interest right now.

If you know of a group like this that already exists, please let me know!

Thanks!
Bekah