In about 10 minutes, I’m headed to opening night of Penumbra Theatre’s 50th anniversary production of “A Raisin in the Sun,” being staged at the Guthrie Theater. I have high expectations–there’s no question that Lou Bellamy understands the material, or that the Guthrie’s Proscenium Stage is a terrific venue for this classic story. But I also have become accustomed to seeing Penumbra stretch out and relax into the familiar confines and the embrace of its audience at its home theater in St. Paul–will the production feel overplayed in the big blue house? I’m very much looking forward to finding out.