There are roughly two dozen lesbian bars in the United States. The ones that are left are evolving to survive By Alicia Wallace, CNN Business It’s just about closing time on Thursday in early June and the regulars are catching up and winding down after a busy night of darts league. They shoot the breeze, fling back a couple of shots, and spout off lyrics (“get on your bikes and ride!”) to accompany the tunes playing overhead. Come back tomorrow night, they say, because it should be a hoot — a “Hootenanny,” to be precise. In addition to weekly drag shows, music and other events, once a month, the Hootenanny Harlots drag troupe put on a comedy show that’s a little bit country and a little bit, well,