Need to send a reminder to everyone coming to your farm dinner? Until now there was no way to message event registrants as a group — the campaign segment builder could target subscribers, order history, groups, and waitlists, but not the people signed up for your events. Now Event is an audience type in the builder. Pick the event (or events) you want to reach, and a Registration status filter lets you narrow to confirmed, checked-in, or cancelled attendees — it defaults to confirmed and checked-in, so campaigns go to the people who actually plan to show up. The audience resolves to each attendee's contact details for email or SMS, and all your existing campaign tools — templates, scheduling, and analytics — work exactly the same way.