Around 30 people crowd into a small bar in a quiet neighborhood in Lisbon for a film screening. It’s a Wednesday night, but the place, called Valsa, is full, despite the fact that it’s in a peripheral residential zone. “Valsa” is the Brazilian translation of “waltz”; the Mittel-European folk dance that arrived to Brazil via Portugal in 1808. Danced in the elite salões of Rio de Janeiro, the term is now back on this side of the Atlantic, thanks to this tiny Brazilian-run association with one of the busiest cultural programs in the city.