If you’ve been using OneNote for a long time, you may have used online calendar templates in the past. OneNote 2013 and 2016 no longer include calendar templates, but it's easy to make your own.
Create your own calendar template
Set a calendar picture as a background
If you see a calendar you like online, or in another app, such as one in Outlook, you can insert a screen clipping of the calendar into OneNote.
To type notes over the blank calendar, drag the picture to where you want it to be, right-click it, and then click Set Picture as Background.