It was all the way back in November that we brought news — via The Upstate Life — that Sufjan Stevens would be playing a free show at the Kennedy Center. Unfortunately, that teaser was all we had to offer; ticket details weren’t available, and the concert wasn’t until February 5. Well, it’s finally time. If you’re keen to see Sufjan — or the NSO, or the Alvin Ailey American Dance Theater — get…