How do you deal with divorced parents who cannot get along?

The best way to handle this potential problem is to sit them down ahead of time and explain to them that this is YOUR day and that you love each of them and want them all to participate IF that's what you have decided to do!

When it comes time to have pictures taken, have them done with all of the groups ie:
One of you with your mother (and her new husband, if she is remarried) for HER, one of you and your father (and his new wife, if he is remarried) for HIM, and one of you with your mother and father for YOU.

Another messy situation can be the first dances. If the divorced parents get along well enough to dance at least part of a dance together, you are lucky. If not, maybe you can have the father ask his new wife to dance, while your stepfather can dance with your mother. If only one parent is remarried, and the other has not brought a guest to the wedding, how about a special family member?

With a little planning ahead of time, and quite a bit of patience, you can manage to make this situation tolerable!