I love this weapons policy from the Michigan Renaissance Festival
The Festival bans guns on our premises. Longbows are allowed as long as they are not strung, arrows with tips are not allowed unless you are competing in the longbow competition that day. Swords, knives, dirks and daggers must be completely sheathed and peace-tied. Axes, claymores, maces, antique firearms, pikes and halberds are NOT allowed on the Festival site. No drawing of any weapon at any time.
I can't think of another event that could pull this off.