I would agree with the "only on specific occasions" choice. I'm sure a lot of people want to strap on a dirk (or even a sword) because they have this romantic image in their heads from the time gentlemen regularly wore their arms about.

Well, this is the 21st century and that just isn't done anymore, except for specific occasions.

I know those blades can cost a lot and you want to show them off, but leave them home unless you have a specific occasion for it, like those mentioned before.