Insert Monthly/Yearly Calendar without need for plugin
It seems that creating a calendar should be core functionality of OneNote, but at least the desktop version can accomplish it with plugins. The Metro version is just out of luck when it comes to calendars.
Robert Paulsen commented
I'd say 50% of my meetings involve some form of planning/scheduling. Sometimes it's for the week, month or year. I don't need an integrated calendar "App" -- I just need a table with Sun-Sat, or a specific month, or a yearly Jan-Dec. I laugh to myself because the other day I used Office Lens to take a photo of the yearly calendar from my Bank and saved it to my desktop. At least now I can add a yearly calendar to OneNote -- but seriously this seems goofy.
Having the ability to insert calendars would be great for me as a student, because having just one is not enough. It would be convenient to have a calendar that I can insert onto the page and edit in important dates that I need to keep track of visually.