If you cannot attend a section, click all the buttons in the right "Click ALL if not available for section" column. You MUST make a layout selection for each pick available. Picking one layout and then clicking "Cannot attend" for the other layouts may mean you won't get the layout you wanted to operate, regardless of how early you register. The purpose of this event is to enjoy operating on a variety of layouts, not just one.
Your registration badge is your pass to the home layout tours on Saturday evening.