As we all know (and many brides get scolded*): It's about the marriage, not the wedding.
But in a way, planning the wedding can be about the marriage. As you and your groom work through the etiquette minefields and heightened emotions and expectations (including your own), that's actually some pretty hefty practice for the difficulties of marriage -- with in-law negotiations thrown in for good measure.
But many faiths or clergy members are requiring couples to undergo some form of pre-marriage classes or counseling, to be sure that the big issues that can affect a union have been discussed between them.
Are you participating in premarital counseling?
* Insert eyeroll here. Because, just for the record: It is totally possible to be very wrapped up in planning the party and still not have lost sight of the real purpose.