Lead/Guest registered for an event:
When you register a guest for an event they are protected up to and including the date of the event until midnight.
Lead/Guest registered and attended event:
Protection automatically extends 30 days to the registering ICM once a guest is checked in by the host.
Lead/Guest registered but did not attend:
Protection is not extended past the date of the event. You lose protection on your guest at midnight unless you register them for another event.