Welcome Lucia. That is awesome that you volunteer at a Ronald McDonald in Brazil. Yes you can definitely visit the one in Columbus, and it would be good to schedule a visit but not a have to. I also volunteer at this one in Columbus and love it. It would be fun to meet you. Enjoy your visit
It would be nice to let them know that you are coming, but I wouldn't think an appointment would be necessary
Lucia, Welcome here in the US! Please call there! I hope you'll be welcomed to visit here in Cols. All the best to you.
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