Hi,
Thanks for using our plugins. I can help out here.
By default our plugin does do as you ask.
If you check out our demo site you can see that here:
http://wpshindig.com/events/
It looks like your theme includes customizations that removed this. I can try to help out, but limited in supporting 3rd party coding.
Here is the css we use by default:
.tribe-events-othermonth .tribe-events-month-event-title, .tribe-events-othermonth div[id*=tribe-events-daynum-] {
-ms-filter: "alpha(Opacity=40)";
filter: alpha(opacity=40);
-moz-opacity: .4;
-khtml-opacity: .4;
opacity: .4;
}
You might be able to use that as is or with some modifications to get it to work how you would like.
Let me know if you have any follow up questions.
Thanks