You may need to have multiple individuals assigned to an event. You can add and remove personnel through your Event Inbox.
First, search for and click on the event for which you wish to add personnel.
Click on +Add Person.
Use the search boxes to search for the name or unit name of the individual. Click on their name to assign them to the Event.
On the Event screen, you can click on an individual's name to unassign them from the event.