In events-class-widget.php, the link to "View All Events" does not work if viewing a non-events category of blog posts. For example, if in this view:
http://www.example.org/category/fundraising/
clicking "View All Events" leads one here:
http://www.example.org/category/fundraising/upcoming
when it should go here:
http://www.example.org/category/events/upcoming/
Removing the exclamation mark from lines 669 and 683 of template-tags.php corrects the issue when viewing category archives but breaks the widget when viewing the home page.