Hi, Lori- I had BAHA surgery 3 days ago. I was really worried about how my hair would look too (work in management and wanted to be sure I'd look professional). You may want to go see your hairdresser about the best way to cut your hair to cover the BAHA. I had mine layered long on top (it's really thick) so that it would cover the anticipated site. Even so, I'm going to have another cut after my first postop visit tomorrow because, while the top layer covers things up pretty well, a good bunch of my hair had to be shaved off during surgery so I'm not looking too even!
One thing you might think about though when looking at timing is that you've got to keep the foam dressing dry after surgery until you have your first postop appointment. There are some very good suggestions about how to be able to wash your hair but still keep the dressing dry on the BAHA support website's Top Ten Tips but it's not too easy. I'll be able to wash my hair tomorrow before seeing the Dr. but then have to keep the dressing dry another 5-7 days. Since I'm an every day washer, I'm not feeling too great at all about this but I'll discuss it with my doctor some more tomorrow for any other suggestions. You'll want to keep things like this in mind so you can feel and look your best for that party! (Maybe wait until the New Year?)