ShyGuy007,
Yes, you may enter the bar and notify the hostess on duty that you have an appointment with a particular Courtesan and you’d like to meet her at your table in the bar. You are not required to ring the parlor door buzzer and enter there if you would rather sit in the bar briefly. I suppose you’ve emailed her already. These few minutes in the bar will give you some time to get acquainted and maybe make a connection before accompanying your Courtesan to her bedroom for negotiations. Of course, the Courtesan with whom you have a reservation would like to party with you, but if for some reason you decide she’s not compatible you may jilt her gently and select another Lady.