The Meeting Requests function is a great networking tool for attendees to engage with each other on the day of the event and to follow up with afterwards. 

Using the ShowGizmo app, attendees can request meetings with other attendees. Once a request is made, an automated email is sent from one user to the other.

When setting up their user profiles, the attendees at your show do have the ability to turn off this function for themselves only, if they don't want to receive meeting requests.