Pachanga festivals and congresses

In Cuba in 1955, Los Papines fused the violin-based music of charangas and the trumpet-based music of conjuntos Eduardo Davidson's La Pachanga (1959), recorded by Orquesta Sublime, introduced Cuba to a Colombian dance (which was confusingly called "charanga" in the USA). But, as Fidel Castro seized power in Cuba (1959), the epicenter of Latin music moved to other islands and then south. Charanga and pachanga became brief fads in the USA, while the "son" left Cuba and migrated to Puerto Rico.

As a dance, pachanga has been described as "a happy-go-lucky dance" of Cuban origin with a Charleston flavor due to the double bending and straightening of the knees. It is danced to the downbeat of four-four time to the usual mambo offbeat music characterized by the charanga instrumentation of flutes, viollins, and drums.

Source:
http://en.wikipedia.org/wiki/Pachanga