Electronic Sign In

A sign in page to help record attendance at an event/meeting
(thinking on mobile device or tablet)

This could display as a list of invited names or a grid of profile pictures (if used)
Pressing the name/picture would select (allowing for multiple selections) and click a next button to submit
Followed by a prompt to confirm contact details for the person/s attending is correct (phone number)
When confirmed or changed, invited person is marked as attended for event

Additionally, this would also be great as a sign out as the system knows who is signed in.