I've been successful in simulating a "calendar page" menu button using the quick page post redirect plugin: http://wordpress.org/extend/plugins/quick-pagepost-redirect-plugin/
and the following URL: /category/events/?eventDisplay=month
In my theme however the page title "calendar of events" is overlaying over my previous month navigation.
I have been unsuccessfully at locating where the page title is being loaded from. Can anyone point me in the right direction?