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.

Anas Mir

If you want more subscribers then you should place subscription box to the correct place. This plugin adds 
Feedburner Subscription Form at the end of your post content.
<ol>
<li>You can change your Feedburner feed</li>
<li>You can apply different CSS to Subscription Form Button according to your Blog theme</li>
<li>Very Easy to implement.</li>
<li>Just 2 step Process.</li>
</ol>

WP Subscriber Form

Adds Feedburner Subscription Form at the end of post content.

Subscriber Addons for The Events Calendar vs WP Subscriber Form