Combining the nostalgic allure of a speakeasy, the surprise element of a pop-up restaurant and the reward of being “in the know,” a new-to-St. Louis group has emerged in the past year that brings those feelings to the concert-going experience. The name of the collective is Sofar Sounds and it has ties to a worldwide movement “Everyone, you’ve gotta just trust me here,” said Chris DiGiacomo, one of the city leaders for Sofar Sounds’ St. Louis branch. Why the trust? People who sign up for Sofar