Confused by Events+ And Categories

Hi there - I'm a bit confused so maybe this will be an easy one as I'm not the sharpest tool in the box...

On Events+ there is the possibility to create and add categories at the back end. But this doesn't seem to work for the front end event posting. There's no place to choose a particular category of event - should there be?

Also is it possible to search for all events of a particular category - the same way it would be for a post category? If so what would the format of the URL be - e.g. example.com/events/category/sale etc?