Sociedad Union Theatre of San Carlos was inaugurated on January 1st, 1929, holding a very large crowd, among which stood out the presence of the renowned composer Eduardo Fabini.
It works as home of the Sociedad Union, founded on December 1st, 1891, and that had its first office at 18 de Julio street, Nr. 91.
Before the theatre's inauguration, the building had belong to the Sociedad Progreso Carolino.
Nowadays, the place also works as cinema and occasionally holds rock, folklore and other music genres recitals.