The layout, set-up and culture of each bookstore is different--even with bookstore chains that are supposed to be similar. I've had bookstores put me over in a corner, in the back of the store, in the front, in the children's section (I'm not kidding and I don't write children's books). As an author, you never know what to expect when you arrive at a book signing. My advice is to be prepared for anything! Be good-natured about it and keep smiling-no matter what.