This page demonstrates the the use of Navigation and the Volunteer Events module. 
If you are logged in as a Webmaster, you can add navigation items (click the blue dot next to "Volunteer Information"). 

Volunteer Events, like News and Calendar, are "contributed content" and have Approved, Pending, and Archive status.  Click the red dot next to the Volunteer Event sub-section.
See the tutorials for Navigation and Events to learn more.