Can't save changes to one event back-end

This issue seems to be related just to my event named bRUNch.... but at the backend if I try and make a change to the event description (or anything else) and save it, the save just fails with my browser throwing a 'No Data Received' error.

Any ideas what might cause that? Other events that I've tested so far seem to be saving ok. Just that one called bRUNch. Site details provided if you can take a look. Thanks!