Wearing a Sgian Dubh in SPAIN

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As the date for my Scottish wedding draws near, I am working on making my guests' visit as comfortable and seamless as possible.
One of the potencial problems that came up was the sgian dubn and the law. So I went straight to the authorities, and asked them directly.

It is illegal to carry any knife, of any kind or length, with you in public, in Spain. That said,

If it is part of a ceremony or ceremonial dress, it can be worn during said ceremony, but not to and from the venue.

Transport of knives should be in their sheath, and in the trunk/boot or luggage carrier of the vehicle. It must not be readily available to any passenger.