So, this means we have essentially NO time in which to look at our schedules, such as they may turn out to be, before we need to begin the mad scramble to fill our empty time blocks with events that still have open seats, which in the past two years have become predominantly nonexistent within the first hour after event signup began. Welcome to yet another boondoggle with the PaizoCon lottery system for signups.
You folks might want to go to a simpler system more like they run at another local convention, Dragonflight, where they limit the preregistration seats in any event to no more than 2/3 or 3/4 of the available seats, and then they post actual physical signup sheets several hours ahead of each time block for people to sign up for the remaining seats. There system never ends up screwed up as bad as the PaizoCon systems have consistently been. Your current system is clearly broken, and you seem unable to actually fix it.