From YPPedia

Weddings often occur on the oceans. These are purely social events; the game does not provide any indication of a pirate's marital status.

The palace shoppe sells trinkets that may be inscribed and used for weddings. The two available types are bands and gemstone rings.

The Events! forum has a specific thread for wedding event announcements.

Historical Note

For a while, it was possible to request a special ship, the Lovestruck Leviathan, for use in wedding pillages. That service is no longer available.

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