Events Booking allow you to export registrants to CSV/Excel file from frontend of your site if they have permission
Users who has registrants management permission can access to Registrants Management page will be able to export registrants from all events or from the selected event he wants, same way with exporting registrants from backend
Users who has registrants management permission or user who created the event, when browse for that event (in events list or event details page) will see an Export button to allow Exporting registrants of that specific event