Most of us prefer to sit with our clients for a bit, especially with a couple, prior to our party, but as always we all work differently, so it’s best to email your lady of choice ahead of time and ask her what she prefers.
Also, if you aren’t too nervous to do so, it may be a good idea to go back with your courtesan upon arrival just to get a general idea of each others expectationsn and then spend some time in the bar before your actual party, this way it’s nor a waste of anyones time. If you sit with a lady for an hour or so in the bar and then find that you two can’t come to an agreement then you have wasted the time that could’ve been spent finding the right girl for you and the ladies time that she could’ve spent with someone in her price range. If you just can’t get up the gumption to negotiate first then it is a respectfull courtesy to tip your lady for her time if you do not reach an agreement. This way there are no hard feelings and everyone leaves happy.