Can you advertise it on your website, assuming you have one? You can write a blog about it maybe too, although I wouldn't make it too touty if you're going to put it on Adultwork because they're not supposed to be for advertising.

Bar that I can't see there's much you can do except state that you're available throughout Christmas as New Year - you can't dictate what punters want to do when they're the ones paying? If you get people asking for shorter bookings then you can always just tell them you're busy but they can check with you nearer the time.

Would you be offering it as an incall and cooking, or expecting to go out/stay at a hotel? Did you have a fixed price in mind?