The calendar widget from the appstore: https://appstore.home.mendix.com/link/app/248/
is based on the open-source jquery full calendar. I think it might be possible the tweak the widget with a custom view in order to show a year. Check out: https://fullcalendar.io/docs/custom-views might be a bit of work though!
I don’t have much experience with jquery or customizing widgets...did you ever figure this out? I would love to hear about it if so! :)