Go to Admin 1-2-1 and select the one you want to modify. Go to Registration Process → Survey and add the questions. If you have any doubt follow this link: How to build a questionnaire on EventsCase?
This survey will be helpful for you as an organiser and for your 1-2-1 users. You will be able to filter by the answers on the attendee list and the users could also use the filters to find other attendees to arrange meetings.