Is there a way to maximise the size of the map

Hi

Is there a way to maximise the size of the map in the individual event listing page please? Attached is a screenshot of the map I mean. I'd like it to be full width.

Here's a URL to that page too.....

http://greenwichmums.staging.wpengine.com/events/2015/02/westendin-greenwich-theatre-workshops/

Thanks very much

James.