The Weekdays setting of recurrence rule used is specified in the Weekdays panel of the recurrence rules tab control.
The Weekdays recurrence settings specify if there are there any special cases depending on the weekday on which the holiday occurs. When a holiday rule leads to a date that is a specific weekday, you can choose to have the occurrence moved, duplicated or deleted.
Important: the Weekdays part of a recurrence rule is processed before the recurrence rule offset settings.
See also: Holiday Names Variations.