Gary Jones

Can add multiple calendar widgets – each of them set to different categories (or All Categories).
The tooltip on the per-day links shows only post titles from that category, and when you click on the calendar link to bring up the day archive of posts, only posts from that category are shown.

Calendar Category

Un-registers the default Calendar widget, and registers a new one which supports showing only those posts in certain (or all) categories.

Andy Fragen

Barry

The Events Calendar

Add background colors to event categories displayed in the event views of The Events Calendar. This is inspired by the post Coloring Your Category Events.
Settings for The Events Calendar: Category Colors plugin are located in their own tab on The Events Calendar Settings page.
To force a refresh of your CSS, add <code>?refresh_css</code> to the end of your events URL, or re-save the Settings.
<h3>Attribution</h3>
Thanks to jonahcoyote for some early help and direction.
Big thanks to Barry Hughes (WebsiteBakery) for refactoring code and Legend Superpowers.

The Events Calendar: Category Colors

A great plugin and Andy always answers pretty fast

Perfect plugin and Support

Add event category background colors to The Events Calendar events.

Calendar Category vs The Events Calendar: Category Colors