Tournament director

A tournament director (TD) is an official at a competitive sporting or gaming event, who typically perform a number of key functions. The extent of the tournament director's duties varies depending on the size of the tournament, the nature of the competition, and the number of other officials to whom roles can be delegated.

Examples often include:

In fencing, the tournament director is known by the French name, directoire technique (commonly abbreviated to DT).

...
Wikipedia