For specific details of that module, you\'ll need to contact the JEvents developers... however,
if you get that message (which is only IE by the way), it is due to items being pulled in (images, css, scripts, etc) using absolute urls instead of relative. Go through that module and make sure all items being pulled in use relative urls.
An absolute would include something like this:
$mosConfig_absolute_path.\'/images/somepic.jpg\'
A relative would leave out the reference to your livesite or domain:
<img src=\"images/somepic.jpg\">