(SELECT webinars_webinar.id, private, concat_ws(', ', to_char(started_at, 'DD.MM.YYYY HH:MI'), title) as name, 'webinar' as type
 FROM webinars_webinar WHERE webinars_webinar.title ILIKE '%%' and private=FALSE ORDER BY id asc )
UNION DISTINCT
(SELECT webinars_webinar.id, private, concat_ws(', ', to_char(started_at, 'DD.MM.YYYY HH:MI'), title) as name, 'webinar' as type
 FROM webinars_webinar
  JOIN webinars_webinarattendee on webinars_webinar.id = webinars_webinarattendee.webinar_id where attendee_id = 2
)