Have you read the documentation on installing a module? You need to run /dev/build after installing the folder. Then you will have Calendar and Calendar Event page types in the CMS.
I would recommend downloading the latest version of event_calendar. There have been many revisions since your download. If you use SVN, you should be checking out from http://bluehousegroup.svn.beanstalkapp.com/modules/trunk/event_calendar
I installed a virgin SilverStripe 2.3.1 and with no modification (so far) I installed r14 of event_calendar from svn .
However: 1) in blackcandy the part of page is moved to the left
2) Only Date but not time is shown (it is a plain no repetition event with StartTime 2009-04-06 14:10 and EndTime 2009-04-06 15:00. How to show those on both Calendar and CalendarEvent
If your locale is set to anything other than en_US, you need to define your date display in the lang folder. Please see the thread "Preview: Event Calendar Module" for more information about how to do this. I still need to document it. You can use the lang/en_US.php file as a reference.
<% control CurrentDate %>
<h4><a href="$ICSLink" title="Add to Calendar">$_Dates</a></h4>
<% if Times %>
<% control Times %>
<% end_control %>
How can I put Time back into both Calendar and Event
Another question: It is easy to add extra fields to "Dates and Times" tab; how to add them to main tab and/or to CustomTab?