Marriage is a matter of opinion. Someone is pro, different against. They're not going to be married today. There was no once that the children were born into a nonmarried couple. Nowadays it is taken differently and couples can live together and have children. It's still a nice and nice tradition, and surely every woman would wish to play the princess at least once in his life.
Playfully or in style
Someone can do it like a celebration, a smaller one with nothing big or flasher, but some ladies wish to have a magnificent ceremony with all the proper formalities and other trinences. Someone is just a ceremony in the ordinary hall, another one has to have in the castle, so you have it with every thing that relates to it. You can make a wedding announcement of gold, or you can have ordinary only nicely shaped. As you wish.