Unfortunately, if we have sold out an event date, we cannot add anyone else to the event weekend.
We have factored in everything in determining our capacity (no shows, etc) so when we close an event date, this ends the last opportunity to register for this date. Because of this, we rarely have a wait-list available. If we do, we'll post this on the event page. However, we'd recommend signing up for another date, as a wait-list is very unlikely.