In October, Valle de Guerra holds a festival to honour the Virgen del Rosario.  The most relevant event is the re-enactment of La Librea, which has become the main identity symbol of the village.  It was designated Cultural Heritage Asset in 2007 and celebrated its 400th anniversary in 2015. It is held on the Saturday after 7 October.

After mass, the event includes a procession of the Virgen del Rosario, which is escorted by a Captain and his squad clad in period uniforms and guns like those used in the 16th century. Then they perform an eucharistic play inspired by the historic Battle of Lepanto that took place in 1571 and confronted the naval fleet of the Turkish Empire against the Holy League, made up by soldiers of the Spain, the Papal States and Venice.