[Mark McLeod]

After the first-come/first-served open slots are all taken the events maintain a small discretionary waitlist of teams registered as wanting to attend.
Each event has 10 or more reserved slots, usually kept for rookies as first choice, but available for waitlisted teams if rookies don't appear to take them. Some events have already begun to dip into their reserved slots and assign them to rookies, so you can't just add 10 to the visible number of teams + remaining slots. You have to have been watching all along, or if an event's at the same venue, then you can probably use last year's # of teams as a guide.

If teams on the event list drop out, then they will be replaced by a team from the waitlist at the Regional Director's discretion. Slots are non-transferable, so you can't give yours up for a friend-no scalping. RD's determine their own priorities, for instance one RD may assign to rookies, then teams in need/struggling, followed by stalwart regional fundraisers/supporters, teams that bring diversity, or the order teams signed up.