Alexis J. Roston channels Billie Holiday in Lady Day at Emerson’s Bar and Grill, Lanie Robertson’s gorgeous evocation of the late, great, ground-breaking singer’s life. Set over the course of Day’s final concert at the titular locale, the show is packed with music forever associated with Holiday (“Strange Fruit,” “God Bless the Child” and others) as well as insight into her struggles with addiction. Directed by Shanesia Davis, this marks Roston’s fourth time bringing Holiday to life on stage. In terms of voice and persona, Roston’s delivers a moving, powerful performance. The Congo Square production runs through Oct. 7 at eta Creative Arts Foundation, 7558 S. South Chicago Ave. $25-$35; CongoSquareTheatre.org.