If you collect information such as interest areas or specialties from attendees when they register, you can display that information in the app as filter keywords or within the session description. Attendees can then search or use filters to segment who they may want to contact based on the information provided during registration. 

Note: If an attendee wants to update their information, all edits would have to be done from the data source - this keeps your registration or membership system up to date and gives you control of what is imported into the app.