As others have said, most of the stars will be there only on Friday, Saturday, and Sunday. Be warned however: their schedules are very, very, very, tight and it you don't book early, you probably won't be able to book at all.
Remember a number of facts: it can take the girls a few hours (yes, hours) to get ready to go to the show. So, if they have to be there at 1pm (and some of them do), that means they probably start getting ready about 8am.
In addition to that, some of them have commitments before the show starts each day for interviews, and even shooting scenes. And some of them have commitments at night after the show - a significant number of them will also set up appearances at local clubs for performances, lap dances, signings, or what have you I know when the show is in NJ, about 20-30 of them go to the Sapphire Club in NYC after the show closes on both Friday and Saturday nights. Some go to local NJ clubs.
And, some of the girls just like to party at night - go out and drink with their friends. Which means they won't be getting up early in the morning and, if they do for a date with you, they may not be at their very best.
The sooner you make your booking, the more likely the female of your choice will be available at the time you want. And this is another reason why it's better to make arrangements with an agency like TLC - the agent will know their schedule and do their best to make sure she is available for your appointment.