Wordpress yeilds the following error message with Event+ active and WP_DEBUG set to true with WP 3.8.
Notice: is_main_query was called incorrectly. In pre_get_posts, use the WP_Query::is_main_query() method, not the is_main_query() function. See http://codex.wordpress.org/Function_Reference/is_main_query. Please see Debugging in WordPress for more information. (This message was added in version 3.7.) in [...]wp-includes/functions.php on line 3049