WSID have multiple lanes to park in, so do a run then line back up the same as a Texi day.
WSID staff on the day will explain it in more detail and show the areas etc. There's nothing hard about it though, so if you're worried about being a first timer or whatever, you've got nothing to worry about. Do it once and you'll be right from there. Any questions on the day and there will be Aaron, WSID staff and club execs there to help out.
If you want to sit out for a run that's fine, you don't have to do every run if you don't want to