The following tags can be used to add content dynamically:
[from_name] - Attendee name[from_email] - Attendee Email[meta_data] - All custom form fields in list format[registration_id] - Registration ID[user_id] - User ID of attendee[event_id] - Event ID[event_title] - Event Title[event_dashboard_url] - URL to the frontend event dashboard page[event_url] - URL to the current event[organizer_name] - Name of the organizer which submitted the event listing[organizer_email] - Email of the organizer which submitted the event listing[date_of_participation] - Date of attendee checkin[event_post_meta] - Some meta data from the event. e.g. [event_post_meta key="_event_location"][meeting_name] - Zoom Meeting Name[meeting_description] - Zoom Meeting Description[meeting_start_date] - Zoom Meeting Date[meeting_start_time] - Zoom Meeting Time[meeting_timezone] - Zoom Meeting Timezone[meeting_duration] - Zoom Meeting Duration[meeting_id] - Zoom Meeting Id[meeting_password] - Zoom Meeting Password[meeting_zoom_join_url] - Zoom Meeting Join URL
All tags can be passed a prefix and a suffix which is only output when the value is set e.g. [event_title prefix="Event Title: " suffix="."]