The backyard of Carrollton Station — which serves as a de facto green room in the Uptown music hub — is a flurry of panicked last-minute preparation. Debates over gear usage take place next to vocal harmony tweaking and chord memorizations. This would normally be a cause for concern in the final minutes before a show, but the Plus One showcase is not an ordinary show. Founded by local musicians Skyler Stroup and Aman...