I noticed problems with it last week too, but I wasn't sure where to post about it.
The week navigation doesn't work. If you go to a month (say, July 2015, to reminisce about the days of ASOT at Ushuaia...) the calendar shows the party dates for the first week. However, if you then click any of the "week" buttons to see other days, you just get the "There are no events for these dates." message -- even if you go back to the first week.
It's definitely a great feature to have on the site, like for the times I'm trying to remember the full lineup of some great night I had a few years back.