Gmaps problem is solved. I forget to insert the api key.
The color is still pending.
Sorry and thanks
there is no mass edit to change colors
however if you add this to the calendar shortcode:
then go into events>>>>event type
you can change the color of each event type to the color you want
You probably have less event types than you do events so this would be a faster way
the shortcode I gave you basically makes the event type the color instead of the color you set when editing the event