Build a content wall from attendee posts during the event

Pick one event hashtag before the event and put it on every screen, badge, and sign on site, then pull posts tagged with it into a live display running in a common area during the event. Save the best posts afterward to repost across your own channels for weeks after.

Why it works: Attendees trust what other attendees post more than official marketing, and a live wall gives them a reason to post in the first place.