Some other strange times are hard - early December and October book pretty solid pretty early. In fact, summer is usually better than either of those two times. Events you don't normally think of if you aren't a participant can cause strange blips - the marathon is a good example - people who go to Disney every year for the marathon sometimes choose to own DVC for that trip - and can create tight availability in January - a strange time of year and if you aren't a runner you don't even think about that being a draw. Jersey Week - if you aren't from Jersey it doesn't occur to you that a lot of DVC members go that year every week. It doesn't even occur to folks in the Midwest that people in New Jersey have that week off school. Also, it depends on what you are willing to accept in terms of availability. Sometimes there is a studio on Monday at BCVs, a one bedroom Tuesday and Wednesday over at SSR, and the rest of the week is available in a OKW one bedroom - if you are willing to move mid trip there will be more availability short notice than if you want to stay in one room.