This plugin pretty much breaks everything when DEBUG is on.
when trying to work in the admin area any time you try to update a post or submit a form:
Notice: Undefined index: venue in /wp-content/plugins/the-events-calendar/lib/the-events-calendar.class.php on line 1437
Notice: Undefined index: organizer in /wp-content/plugins/the-events-calendar/lib/the-events-calendar.class.php on line 1475
Notice: Undefined index: venue in /wp-content/plugins/the-events-calendar/lib/the-events-calendar.class.php on line 1437
Notice: Undefined index: organizer in /wp-content/plugins/the-events-calendar/lib/the-events-calendar.class.php on line 1475
Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/the-events-calendar/lib/the-events-calendar.class.php:1437) in /wp-includes/pluggable.php on line 934