Broken

Sadly it runs into this problem on WP 3.7

Warning: Creating default object from empty value

You can’t add new events. It hasn’t been updated in 3 months and there are a ton of issues out on the bug tracker. I assume it is done until the author decides to pick it back up again. Shame because it looks perfect!

http://ww.wp.xz.cn/plugins/ajax-event-calendar/