Free concert at Praça do comércio (commerce Square)
This was the information found at the website of the organizers:
Toca a Todos is a fundraising concept to support a cause, born in the Netherlands, by the 3 FM radio that quickly spread to countries like Belgium, Sweden, Switzerland and Kenya, and now arrives in Portugal to raise funds to support the fight against child poverty developed by the Portuguese Cáritas. During three days, 72 hours, three radio broadcasters from Antena 3, Ana Galvão, Diogo Beja and Joana Marques, will be installed in a glass cube in the Commerce Square, broadcasting the "longest radio broadcast in Portuguese history". Everyone can leave their donation on-site.