Currently when editing an event you can set a Group to Event Gradient background style and it will pick up the event colors that are already set. If, however, you change an event color, you need to refresh the editor in order for it to refresh all groups and other blocks who use those colors (since the event colors are inserted as inline styles). See if you can make it dynamic so it doesn't require a refresh of the editor window.
Currently when editing an event you can set a Group to Event Gradient background style and it will pick up the event colors that are already set. If, however, you change an event color, you need to refresh the editor in order for it to refresh all groups and other blocks who use those colors (since the event colors are inserted as inline styles). See if you can make it dynamic so it doesn't require a refresh of the editor window.