At some point the married couple may become the object of a charivari, a good-natured hazing of the newly-married couple. While this is most familiar in the form of tying tin cans to the bumper of the couple's car, or spraying shaving cream on the windows, some of the pranks can be far more malicious. The worst one I've ever heard of is when the bride and groom returned from honeymoon to find their front door had been bricked over.
The final tradition is the newly married couple to set off for their honeymoon.