Your event app comes with a messaging service between attendees called "Networking" which allow them to find the list of present attendees, read their contact details or contact them directly.
You look at the list of attendees and you find out that some attendees do not appear. Find out in this article why.
The attendee has not yet log in to the application.
Attendees appear in the "All" list of the "Networking" service from the moment they have logged in at least once to the application.
The attendee chooses not to appear in the Networking service.
At Eventdrive, we allow users to appear or not in the peer-to-peer messaging service. Users can choose if they wish to be contacted or not.
A user can do so by checking the "Invisible" mode found at the top right of the screen in the messaging service. So other users of the application do not see him/her and can not send them a message or schedule appointments.
To learn how to switch to the incognito mode, read the following article: How to turn off Networking?