You can search for board members by location.
At the top of this page, right under the "d" in the script Quilting Board logo,
click on the "Member List' hotspot
When the member list comes up,.
Under the W X Y Z, click the "Search Members" dropdown and select "Advanced Search"
In the location box, type in your desired location (I put in Argentina) and click the "Search Now" button.
A list of members from that location will come up with their join date & # of posts. I would pick one or two folks who post a lot and send them a PM. Even if they haven't posted recently, the message should go to their email.
You could also repeat the location search for Buenos Aires.
Good luck and have a wonderful trip!