I have friends who got married at midnight in a public garden, then their reception was a breakfast the following day. SO cool. She wore a white and black dress, and it looked amazing in the moonlight. So it can be done.
If you can't get a cemetery, I'm sure you could get a park next to a cemetery, go in to the cem for photos after - it's amazing what you get away with in a wedding dress

Good luck, sounds fab.