Playing Broadway legend Ethel Merman is far more exacting than embodying her larger-than-life persona. No one knows that better than Broadway’s Rita McKenzie, who has been reliving the glory days of the iconic Merman in her one-woman tribute, Ethel Merman’s Broadway. McKenzie’s more than convincing, almost eerie transformation, into the star who has been deceased for 24 years draws crowds everywhere the show is booked. Saturday evening at the Music Center at Strathmore will likely be no exception to that stunning record.