Generally a week or so prior to the event a team leader should be selected from the people that are rostered to the event. They will act as the person in charge of the team which has been assigned to the event on the day. Their details will be included in event reminders to your staff, as well as in any event information emails which you sent to your clients through the system (you can obviously remove this if need-be).
If you prefer, you can have the system automatically select the team leader as you roster staff to the event. As the first person is added to the event, they will initially be selected as the team-leader for the event. If they are removed, another person will be selected as their replacement.
You can manually select the team-leader for the event at any stage in both scenarios by clicking 'Update Roster' on the details page for the event, and then clicking the 'change' link in the top-right area next to the name of the person in charge (shown below)
