Call for collaborators – Visualizar’15: Commoning data (data for the common good) – deadline 4 May 2015 http://medialab-prado.es/article/visualizar15convocatoriacolaboradores Open call to collaborate in the international project prototyping workshop Visualizar’15: Commoning data (data for the common good), that will be carried out from May 5 to 20, 2015. Collaborators will participate in the production of selected projects that propose different uses of big data to improve live in the cities and institutional transparency. The workshop is complete with a series of conferences and meetings on May 5 and 6. Medialab-Prado Madrid offers free lodging to collaborators in youth hostels during the workshop (limited seating, shall on request and by order of registration). Free registration. Deadline: May 4, 2015.