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Festa de la Merce is a Barcelona festival in September with an interesting history behind it. A few hundred years ago, the city suffered from an invasion of locusts. After being unable to get rid of them, the city put its faith in the patron saint Virgin of Grace, to help in getting rid of the pesky insects. When she did, the city decided to create this festival to honour and celebrate her. Today, the festival is celebrated over several days with fireworks, presentations, street parades, concerts and re-enactments of traditional scenes from history. In addition, on the 24th of September, all the museums in the city provide free-entry for anyone who wants to visit.