Event categories appear at the top of the Calendar page. Events appear on the calendar (and in Event Lists on other places on the website) as the same color as their respective category. Users are able to sort events by clicking on Event Categories.
To add a new event category, navigate to your WordPress dashboard, Events, then Settings. Then click the Category Colors tab.
A list of all your current event categories will be displayed. Find the one you wish to edit.
Make sure No Border is checked for Border Color.
To select a Background Color, click on the Select Color text, and a color picker window will appear. Choose a unique color for your event. When finished, click outside of the window to close it. Make sure No Background is unchecked.
Then choose which Text Color (black or white) makes the event category's name the most legible.
When finished, scroll to the bottom of the page and click Save Changes.