Several couples dancing while a chulapo (man dressed in 19th century working-class clothes) plays the barrel organ at the "Baile vermú castizo" (Traditional Vermouth Dance) during San Isidro 2018.
In May, Madrid celebrates the festivities in honour of San Isidro Labrador, the patron saint of the city and of all labourers.
+info: https://www.esmadrid.com/en/san-isidro