Welcome, Ildefonso! It would be great to meet you and talk about your experiences with your LUG in Brasil, and also as an Ambassador!
I don’t know if you’ve explored our forums yet (there is a lot to take in, for sure), but we’ll actually be at Maker Faire tomorrow and Sunday, and if you have some free time and want to come meet some of us and hang out at a cool event, please do! It’s at Allegheny Center on the North Side (pretty close to the stadiums). The information is on this thread:
http://www.steelcitylug.com/forum/topic/maker-faire-oct-11-12/
If you have that light printer robot and wanted to bring it, that could be a big hit, although our booth is small and I’m not sure how easy it would be to demonstrate in an outdoor daylight setting (we are under a tent, but it will still be pretty bright outside.)