A short clip from the final dress rehearsal for Opera Roanoke’s production of Richard Wagner’s “The Flying Dutchman,” which opens 8 p.m. tonight (Sept. 21) at Jefferson Center and is performed for the second and last time 2:30 p.m. Sunday. This is Opera Roanoke’s first attempt in its 36-year history to fully stage a Wagner opera. I wrote about the production in much more detail in my Sept. 10 column (click to read.)