Via the Ticketing Dashboard you can check how many persons of a group order attended your event. Also you can check how many did not check in and how many cancelled their ticket. This article gives a step-by-step explanation on how to look up this information via the Ticketing Dashboard.
Explanation of Ticket Status responses
Valid: all ticket registrations have the response Valid. This status can be replaced by checked in, cancelled or declined. When the ticket owner doesn’t visit the event and doesn’t cancel or decline the ticket, the ticket status remains Valid.
Checked in: the visitor was checked in at your event
Cancelled: the visitor cancelled the ticket for your event
Declined: the guest declined the Guest List invitation for your event