Registration, the door, and an app that is never out of date.
Three steps, in the order a convention actually runs them. Get the list, scan people in, then know who came.
Get the list
Collect registrations on your own event page, or import the orders you already sold as a CSV from your current ticketing platform. Either way you end up with one list of people, not one list of purchases, and every registration carries its own QR code.
Scan them in at the door
Your staff open the scanner on a phone they already carry and check people in. No hardware to buy and nothing to install in the venue. Scanning the same code twice says the person is already in rather than throwing an error at a door with a line behind it.
Know who came, and change the app while they are there
The count climbs live as people arrive. When Panel Room C moves to Room 210 at 2pm on Saturday, you change the schedule in Zeva and announce it in the same tap, because the attendee app reads from your event instead of a build you shipped weeks ago. When the doors close you get registered against attended, and who returned from last time.
What the dashboard looks like
Sample data. Fictional venue. Figures are illustrative.