Luján

The provided articles do not contain any information about a place called "Luján." Instead, they focus on the Argentinian-Spanish singer Nathy Peluso and her recent activities in Barcelona, Spain. Peluso gave a surprise concert in Plaça de Catalunya, Barcelona, promoting the new Cupra Raval. The concert was announced on her social media in the morning, drawing a crowd of fans. The articles also mention her perspective on home and belonging, describing her as a nomad who doesn't feel tied to any particular place. Therefore, based on the given information, there is no newsworthy event or development related to a place called Luján.