"Advanced booking" seems to be creeping in now instead of advance booking or advance sales. That would be in contradistinction to "elementary (or even intermediate) booking"?
Oh, and re my post above on 15th July: took delivery of the new Folk Festival brochure today, having not had anything to do with the production of it this year. The chairman confirmed that there had been the usual "3 pairs of eyes" checking it, but it still fell to the printer to point out a missed error on the first page!