I've just returned home after spending a few great weeks in Buenos Aires where I also spent some time at the club. If you're thinking of doing a spot of volunteering, I can recommend a visit. Here we are messing about with paint and attempting to make bracelets out of pasta.
It doesn't matter what your age or background is or how long you plan to stay in town, you're sure to be able to contribute something. There's always some activity going on, but new ideas are always appreciated. The folks there will make you very welcome - even if your Spanish is as bad as mine was!