mywptrek

Subscribe your viewers to your calendar and inform them about your new events. 
Enable subscription to your events calendar. Inform your audience each time you create a new event.

Subscriber Addons for The Events Calendar

Subscriber Addons for The Events Calendar. Subscribe your viewers to your calendar and inform them about your new events through email.

genkisan

<ul>
<li>easily switch on and off through Admin Options</li>
<li>display message without editing theme files (above 1st post or through widget)</li>
<li>display different message to different roles/users</li>
</ul>
Demo: 
<a href="http://ericulous.com/2007/03/09/genki_announcement/" rel="nofollow ugc">Plugin Details & Demo</a>

Subscriber Addons for The Events Calendar vs Genki Announcement