The calendar is great and really easy to install and start using.
I have set mine to have slug of /classes/ and have a corresponding menu item to it.
If I go to the slug, either by the menu or the direct url of http://charlotteswebpapercraft.com.au/classes/ the menu shows that the menu section is Chatter, which is the blog but the calendar shows.
If I click on the Chatter menu item it takes me to the blog archive as expected.
Taking a look at the link will show what I mean.