They are based in the USA but play regularly at milongas in Buenos Aires—which is uncommon.
The band indeed, have their origin in milongas in the USA. A San Francisco producer wanted live music at his events and they got together to perform once a month. The stuck together and developed a following and offers to play flooded in. Since they (2001) Trio Garufa have toured extensively in the USA and Canada (as well as, later, in Argentina).