Currently, if you want multiple calendar views of the same table, you can only have one Display Column display in the calendar view. However, sometimes you have one calendar where you want to display one column, and in another calendar view of the same table, you want to display another column.
For example, perhaps in one calendar you want to display the task name, but in another calendar you want to display the Person’s name.
Right now I see no mechanism to do that with a calendar or gantt view.