Evernote product team, please take note. You should ask users to opt-in to all notifications, even new ones, and especially ones as repetitive as this one. Turning it on without opt-in is intrusive. Furthermore, placing the setting to turn it off under a 'Calendar' option in settings instead of a more common Notifications management page is confusing.
Also, @agsteele, users that are not on the appropriate paid tier are unable to add/access the Calender homescreen widget, meaning they can't edit this setting from there. They have to go into their general settings and select Calendar.