I frequently run into a situation where I need to postpone the due date on a current yearly task, but want the next year’s task to still be due on the original date next year. As far as I can tell, this unfortunately isn’t possible yet which makes organizing my seasonal staff significantly more difficult.
The monthly repeat pattern give you options to choose the day of the month, what you are asking is basically the same. A yearly pattern where you can choose the month and day 
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