It would be nice to be able to update the users status with a QR Code link.

Example:
[ul]
[li]A user prints or brings their phone to the event[/li]
[li]A logged in event organizar or admin scans the QR code on the printed ticket or from phone and the user is checked in or shown as attended.[/li]
[li]If the qr code is invalid (has been used) or expired a message should appear saying so.[/li]
[/ul]