1. This documentation describes how to setup chat to allow only certain group(s) of attendees to chat with certain attendees?

2. In the Event dashboard, click on the "Event App" option located on the sidebar.

3. Click on the Settings.

4. Click on "+ Add Rules" option in the Chat Settings section

5. Click on the "+ Add Rule" option.

6. Click on the "Select Kind" dropdown to view the available options

7. Click on the "Only" option from the dropdown.

8. Click on the "Select Groups" dropdown to view available groups.

9. Select a group for the dropdown.

10. Click on the "Select Group" option to view available groups.

11. Select a group for the dropdown.

12. Click on the "+ Add" option to add the rule.

13. Once the groups are selected and the rule is created, it implies that the selected groups are the ones that are allowed to chat with each other.

14. Click on the save option to save the settings.