I'm attending a con in a few weeks, but I wish it was in Germany instead of the Netherlands. Dutch cons are obsessed with rules. They have rules for the sake of having rules. Just a few months ago, one our largest organizations spend two hours discussing whether one of the small groups (organisations depend on groups of fans for nearly every type of activity and service) could give free biscuits to the people who needed their services. The risks of crumbles was one of the main discussion points.
Most rules don't even make sense. Like, you can't have bags with you, anywhere. They may overlook a fannypack, but those rules change without warning. This is because bags could get in the way and could endanger lives in case of fire (unlike big ass cosplays, those are perfectly safe, of course). Or they could be used to steal things (as if a thief needs a bag to so, they'd just wear baggy clothes). Clothes with large pockets are totally okay, though. A friend of mine likes wearing cargo trousers. They're black and pink and magic. You could fit two days worth of food and water in there. Her trousers are a-okay, my tiny bag that barely fits my wallet, 3DS and mobile phone is a danger to all. And yes, we have offered to leave the trousers at the entrance. Strangely enough, the offer was not taken.
German cons are much more relaxed. They're like 'Have fun, but don't go running around with cosplay weapons like a Darwin Award waiting to happen, and be nice to your fellow visitors and our special guests. Also, don't get drunk or do drugs. kbtx.'
And the worst part? As a somewhat important fan I'm not allowed to say anything about these rules in a somewhat official setting. Apparently putting the bag rule in a negative light could lead to diplomatic trouble. The bag rule is sacred. Blah.