Provide a waitlist for prospective attendees when a ticketed event is sold out. This would allow organizations to reach out to constituents on the waitlist, or even send an automated email when a ticket becomes available.
A transaction type of ticket purchase for an event that shows the breakdown of the ticket order, including fees. If an attendee is associated with any of the tickets, the ticket is linked to the attendee.
Track event registration and event attendance as different interaction purposes
Track event registration and event attendance as different interaction purposes (rather than just "Special Event") so that it's easier to identify who was invited to an event vs who attended the event.