Hi!
I note you already tried deactivating all other plugins and reverting to a default theme, but I see you are using a caching plugin and sometimes extra work is required to eliminate the effects of caching even after you have deactivated the plugin in question.
Right now for instance if I visit the champagne event you referred to I see this in the source:
This Quick Cache file will auto-expire (and be rebuilt) on: Feb 9th, 2015 @ 3:21 pm UTC
So it is effectively “frozen in time” – which of course is essentially the aim of caching. All that to say, are you positive you aren’t simply hitting up against page caching here (does clearing the cache resolve this)?