At the bottom of the Manage Event page on the Guests tab you can see “Enable Event Chat” checkbox.
Clicking it will create a dedicated group conversation for your event which you can access on the event page. You cannot disable event chat once you enable it.
Every guest registered for the event will get added to the group conversation.
If you'd like to try it out from the guest's perspective, register for test event at https://lu.ma/event-chat-demo. We're waiting for you!
If you'd like to watch a video walkthrough of the feature, check out the video below: