public static void PrintEvent(Event eventToPrint)
 {
     if (eventToPrint != null)
     {
         output.Append(eventToPrint + "\n");
     }
 }
 public void AddEvent(
                     DateTime date,
                     string title,
                     string location)
 {
     Event newEvent = new Event(date, title, location);
     this.selectedByTitle.Add(title.ToLower(), newEvent);
     this.selectedByDate.Add(newEvent);
     Messages.EventAdded();
 }