As with most CMS applications, much of the power comes from add-ons. The Joomla Extenstions Directory contains thousands of add-ons in the form of components, modules, plugins and templates
1) To access the Extensions Directory go to this URL: http://www.extensions.joomla.org
2) Let's click on the All Categories link to view the many categories available
3) Let's scroll down to the Calendars & Events category and click the Events subcategory
Scroll down to view the listing of extensions in this category
4) Let's click on the JEvents extension listing to open it for details
Scroll down and to the right to view detailed information about this extension
5) To download the extension for use on your Joomla site, click the Download button
6) From this page, look for the link to download the extension and click on it
7) Select the Save button
Once your download is complete, you can install the extension via your Joomla admin
You now know how to find Joomla extensions to install on you web site