This document outlines a workshop on designing prototypes for "hackable city making" in Athens, Greece. It discusses using urban data and social media to engage publics and empower them to act on communal issues and resources. It provides examples of projects that gather data, visualize it, engage the public, imagine possibilities, and take action. The workshop goals are presented, including designing a prototype for one of four proposed sites in Athens to engage and empower publics. The program includes researching issues, group presentations, updates, and final presentations to share the prototypes.