Yes, that's the difference between the wedding registration, which consists of only submitting a form at the town hall and results in being married in the legal sense, and the wedding ceremony, which is what the characters are doing now and is just a kind of party (you need to have done the former before you can do the latter).
you don't have to worry about it though...damn what a scam the wedding industry is introvert got no chance
so they're getting married more and more?And that's why in many country there are less and less people that never get married.