Calendar Doesn't Work – Possibly Related To Widget

You can find the link here: http://culturalauthority.org/ess/calendar/

As you should be able to see (as I’ve tested it in a variety of browsers to make sure it wasn’t just me being stupid) but on the main calendar page (not the widget), the events won’t expand and seem to break. Is there a fix for this?

https://wordpress.org/plugins/all-in-one-event-calendar/