Events Rich Snippets for Google is a WordPress plugin by job_castrop that adds events as rich snippets to your wordpress blog, this plugin gives you the handles to do that using a simple shortcode system, to find out what a rich snippet event is check this link http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=164506
Demo: http://www.playstation-vita.nl/releases/
Download: http://wordpress.org/extend/plugins/rich-snippets-vevents/