Wedding insurance, similar to a special event insurance, becomes very popular in the U.S. Common causes of payouts include the venue or caterers going bust after having taken a big deposit. Extreme weather, a spouse being deployed by the armed forces and an absent priest can all trigger payouts. Most policies will pay to re-stage the photos if the snapper fails to turn up or disappears with the pictures.
Read this short article by Economist about wedding insurance in the U.S.