We need an option to schedule things by the "third Wednesday of the month."
Sometimes I need to schedule something based on the day of the week and the number of weeks in the month. In other words, if I have something that occurs on the "third Wednesday of every month," I can't schedule it to happen monthly since the number of weeks in a month varies. There is currently no option for this, and I've had to resort to manually calendaring these events individually.

-
Jonathan O’Connor commented
If you currently use ToDoist for your task management, I would make tasks there and just watch the calendar within the Proton Calendar. Their recurring feature is very helpful and I already use the app for ToDos, so it's a win-win. If you have some tasks that go on forever, it is very easy to create tasks. For me, I currently have street cleaning reminders. Hope this helps!
-
Hilbert Schraal commented
Good example of this are Mother's day and Father's day, which are yearly on the third Sunday of May/June
-
Morgan commented
This is a standard feature on most calendar apps, and the lack of this has me using other apps. I would much rather use Proton.