Having a scheduled C-section means that you know well in advance that you will be delivering via that route. Typically, we schedule C-sections one week prior to your actual due date. So if your due date is April 23rd, your C-section would be scheduled on April 16th. This is done to try to prevent a woman from going into labor prior to her C-section date, and therefore turning a scheduled C-section into an emergency C-section.
That being said, there certainly are certain dates that when patients would prefer to avoid, such as April 1st, September 11th and often, a mother-in-law's birthday. In my own practice, I almost always accomodate patient's wishes, assuming it is safe medically. It is possible to wait to schedule your C-section for your exact due date, but the question is whether your baby will wait. The best thing to do is to talk to your doctor and express your concerns, and allow him or her to counsel you as to the best possible date.