On the Calendar, when I click on the day view and the events display, if I click on the event it doesn't open - it just says this page doesn't exist.  I am probably missing a placeholder text.  Can you have a look please.  I posted a fake event in June.  You can test it out.

That is because you don't have a category defined for the event, yet have the event url type on the Calendar Config page to use the category in the url.