It is a used at school or church fairs (kermes). Couples (often students, parents, or teachers) "get married" as a game, and the certificate is a souvenir.
Una cláusula graciosa de "amor eterno" que dura solo lo que dure la kermés. actas de matrimonio para kermes pdf 15 libro
He smiled. They hadn't found the fake marriage certificates for the play, but they had saved the real ones. It was the best Kermes story the town would ever tell. It is a used at school or church fairs (kermes)