Booking in advance is difficult. Today I wanted to book an appointment for tomorrow night and was told I'd have to call back tomorrow morning. I'll do that, but what if I wanted to make an appointment for the morning? Similarly, sometimes DD posts that a superstar will be on duty on such and such day and to book ahead to avoid disappointment, but it appears you can't book anything other than for the same day. On my next visit, I'll see if it's possible to book in advance at the desk rather than over the phone. I know that sometimes the schedule isn't firm until the actual day, but it would be nice to schedule at least a day or two ahead of time.