Event surveys are automatically sent to registrants within 10 minutes of the close time of the event. You are also welcome to share the link to you event's specific survey at the event- it can be found in your event setup confirmation email. It is highly recommended you remind attendees to fill out the survey at the end of the event.
Event survey responses (if any) are compiled in the event's Attendance Report which can be found in your HBA Profile - instructions for accessing the report can be found here and the results will be included on a second tab in the Excel file labeled "Survey Results"