The Hang girls get to demonstrate their versatility with all the activities the organizers set up for them. Clubbing is one of them and there is more to it than just dancing and partying at a Bangkok nightclub. They also get to play bartender and serve drinks sometimes. I think it is just another way to push the hangover drink and to get the girls up close and personal with the crowd. With this kind of outfit I'm sure the crowd appreciates a close look.