Do you ever do a review post based on a holiday?
For example review Christmas theme books in December
Yes. One year I ran a link-up called Christmas in September in which I reviewed a bunch of Christmas books and encouraged other bloggers to link up their reviews of Chrismas books. I had tried to time it so that the reviews would come out before the books, but I couldn't get many people to link-up. I try to review religious books periodically, and if they are based on teh liturgical year, I try to get the review up just prior to that season.