In my experience, it doesn’t matter if they open at 10 or 11, because people will start showing up at 12 or 1am. And there’s some bar/night club hybrids (bar floorplan but packed with standing people and the music is at night club volumes) that for some reason society has marked as “after” places – where you go after your “main” club. These don’t peak before 2-3am, it’s insanity.