Sometimes the wedding announcement we inform about the magnificent ceremony actually ex post. There are people who do not suffer from spectacular splendor and spectacular rituals. Not everyone desires a white dress and an unforgettable feast. Someone doesn't want it for financial reasons, and someone just doesn't get it. The ceremony is perceived as an intimate affair, which takes place between a man and a woman and there is no need for an audience.
Tell others that you have married is however decency
But even in this case, relatives and friends deserve to be informed that this has happened. It's a decency. It goes without saying that the modification and processing of such a notice will then be rather subtle and slightly minimalist, but it does not mean that it should not be elegant and impressive.