Your guests were a little misguided....I'm assuming they are Hindu's which means they should have done their ceremony at the Ganges river, not a lake in America. As I remember from a story about India, the Ganges is their most holy river. Problem is, it's used for a sewer, chemical and garbage dump as well as a graveyard. I guess if you want them to feel comfortable next year....maybe sprinkle a little garbage, oil and a few bloated corpses on the beach........just kidding