Information for Sex in the City Hall at Grand Opera House, Belfast (Play). Callie, Lottie, Maddy and Sammy are four best friends who work together in City Hall. Well, for now... because apparently one of them is getting fired in the morning! But which one? Join the girls as they barricade themselves in City Hall overnight and say 'no surrender' to the powers that be. These women won't go down without a fight. It's all for one, and one for all.