Mystery Theme VI: Topic Occluded by KlionskyG

Question 7

Such is life: At least 133 people died when a fireworks display at a post-wedding celebration set mannequins and other d├ęcor aflame, leading to a panic in which many were trampled and others drowned in the adjacent river. Name both the bride and groom at this affair. (Dessert was presumably served four days before the tragedy, when the teenagers' wedding itself was held.)

Marie Antoinette and Louis-Auguste (Louis XVI) (married May 16, 1770; stampede on May 20)