Volunteer Opportunities in Rio (Rio de Janeiro)

Hey everyone!
I will be staying in Rio for the month of January and would love to volunteer/help with any charities or NGO organizations. However, I am not familiar with any short term commitment ones. I can speak and write in Portuguese and English so I wouldn't mind teaching English classes for free, as well as helping in any other way that is needed. Please pitch in and let me know of any that you guys are familiar with! Thank you and hope to hear from you guys!