The admin app can detect both inbound and outbound visitors through the ticketscan. In the app, a statistic is illustrated for you, showing how many tickets have been sold in total, how many attendees are actually present and how many have already left the event.
The display of the current occupancy rate through the ticketscan can additionally be made visible for your attendees. This can be done either as an integration on your own homepage or on a monitor at the event entrance.