Whenever you click on the widget calendar, it links to #. I have a body_class() call to my <body> tag and the sidebar code is ok :
‘before_widget’ => ‘<section id=”%1$s” class=”widget %2$s”>’.
It sounds like there may be a javascript conflict on your site. Have you tried following the Testing for Conflicts procedures to see if you’re able to narrow in on the source of the conflict (plugin or theme)?