If your Google Map is not showing up on your Event Details page, one reason may be that your theme does not have a call to
One way to check to see if your theme has the call for wp_footer is to go to Themes > Editor and open footer.php. At the bottom there should be code that says
<?php wp_footer(); ?>
This example is from the TwentyEleven theme from WordPress.
If your theme does not have this file, please contact your theme developer and ask them how to include it.