What you see is folks using the Dual Stats plugin. It's available here
http://www.wowinterface.com/download...nfopanels.html
There's 2 things you can do about the Calendar button, one is to open up the minimap bag just above the InfoPanel, it should be there.
Alternatively, you can disable nUI's control of that particular button by typing
"/nui calendar" Which will allow it to sit around the center map again.