Comment submission button missing

Hi everybody (Hi Dr Nick), I’m a bit stumped by this one.

Our submit comment button isn’t visible on our events. I’ve have a look around at other suggestions on quite a few forums but can’t seem to get it to work.

An example of our pages are here:

http://melbournemagicfestival.com/event/rob-zabrecky-lecture-july-4/

Could somebody more knowledgable than me help out please? Really appreciate any advice you could give. Thanks