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Install and activate the WordPress plugins "PostLists" and "Event Calendar 3" first if you have not already done! Event Calendar: http://wpcal.firetree.net/ PostLists: http://www.rene-ade.de/inhalte/wordpress-plugin-postlists.html

Installation of this PostLists-Extension: Upload the folder "ple-ec3" (with all files and subfolders) to your plugins directory ("/wp-content/plugins/"). Then activate the plugin "PostLists-Extension EC3" in your WordPress admin panel.