You can retarget people who responded to your event by using Connections when creating your event ad. This feature lets you target people who've responded to any event, new or old, on your Page.

Retarget people interested in your event

1. Create an event ad.
2. In the Audience section of your ad details, click the Connections drop-down menu that says Add a connection type.
3. Choose Events and then choose People who responded to your event.
4. Click Save this audience.
5. Fill in the rest of your ad details and click Continue to keep creating your ad. Click Confirm when you've finished.

Once your event ad is reviewed and approved, it will start appearing to people who have responded to your event.

* Nguồn: Facebook