Here's a good video that tells a bit about Scientology weddings.
The unique thing about Scientology weddings, as with the Scientology religion in general, is that it is built on practical truths that help the individual survive better in life. When applied to a marriage, they help the partners ensure the future of the relationship with the simple principle of A-R-C, standing for Affinity, Reality and Communication.
Read the Scientology Handbook chapter on ARC for information on how to use this in your own relationships -- not just with husband, wife, partner, etc. but in any relationship you have in life.
And here's the video.