Luminate Online automatically creates a group for Event attendees. To find it, follow these steps:
- Go to Constituent360 > Groups
- Search using the name of the desired Event
- Look for the group that corresponds with the Event name and date of the event. It will look similar to this: "TestEventName 08/17/2017 12:00 PM"
You can use this group as a target group for an email delivery.