Get the Event Type List. 

This is a listing of all of the Event Type items. 

Each Event Type item is represented by a TEventType. The collection of Staff Type items is represented by a List of TEventType. 

A token is passed for authentication. If the authentication fails, or other errors occur, no event types are returned. The result of the authentication is represented by a TAuthenticate object. 

Requires a valid registration key entry for the Event Management feature. 

This function has security level "Unrestricted", and can be accessed by any authenticated user.

[WebMethod(Description = "Gets a list of all event types")]
public TAuthEventTypeList GetEventTypes(string token);