It's difficult to tell what feature you're interested in without some sort of feature description in your question, however looking at the source code it appears that only plugin that's obviously active on that site at the moment might be radykal fancy gallery.
[edit] my apologies... I missed the 'event' descriptor the first time around. That events page may be custom coded into the theme features.
[re-edit] yep' Here it is.. Music: Musicians theme & Facebook app Featuring, "Unique Events Calendar"