I think class nights are relatively secure because the potential thief would have to monitor the movements of not just the owner of the bag/coat/etc, but of all the friends of the owner who might spot them up to no good. Simply put, the risk of getting caught is unattractively high. That's not to say it will never happen - I just think that's why it's rare.
And just to add, the closest I've come to losing an item at Ceroc was when my watch fell out of my pocket. Luckily someone spotted it and handed it in.
Bookmarks