 Complete the following phrase:  The Concert for Freedom was a concert held at Camp Nou football stadium in Barcelona on 29 June 2013, organized by Òmnium Cultural in conjunction with other civil society organization such as the Assemblea Nacional Catalana and the Plataforma Pro Seleccions Esportives Catalanes with the goal using the universal language of music to demand the right of Catalonia and other nations of the world to freely and democratically decide their future. Some 90,000 people were in attendance. Between the 