These docs are for an old release.
Info on upgrading to version 2/3
eventColor
Sets the background and border colors for all events on the calendar.
String
You can use any of the CSS color formats such #f00, #ff0000, rgb(255,0,0), or red.
The eventBackgroundColor, eventBorderColor, and eventTextColor options can be used for more granularity.
This option can be overridden on a per-source basis with the color Event Source Object option or on a per-event basis with the color Event Object option.