What testing tool are you using? I use the Google Structured Testing tool and I put your page in and everything looks good, with exception to a couple elements:
Error: This information will not appear as a rich snippet in search results, because it seems to describe an organization. Google does not currently display organization information in rich snippets
Error: Missing required field “entry-title”.
Entry title is easy, just have to add that to the
heading tag. But also note that your page has no title to it.
Other than that, everything in my test using your page you provided a link to, checks out. Also, you may want to check this out:
http://googlewebmastercentral.blogspot.ca/2012/12/introducing-data-highlighter-for-event.html
