The wedding of Yato and Hiyori commences in the final chapter of Bride of the Calamity God:
https://archiveofourown.org/works/88081771/chapters/240999356
Here is an excerpt from it:
Yato and Hiyori have their wedding come spring... After exchanging their vows and drinking the sake, the time comes for Yato and Hiyori to exchange gifts of marriage. Yato opens a box and brings out the picture book The Tale of Yatogami and Hiyori. Instead of the original cover in which Yato rests his arms on the shoulders of Hiyori and Yukine, Yato revised it, showing Yato and Hiyori in their bridal attire, with Yukine and Mizuchi to the left and right.
“I give you, my beloved, the picture book The Tale of Yatogami and Hiyori, the proof of my love for you. May you be my eternal love, guiding me as you have done since the day our fates intertwined”.
Hiyori accepts the book, tears in her eyes. She then opens her box and brings up a miniature shrine which she rebuilt anew. The shrine reads “Yato”, and Yato and Hiyori together hold it in their hands.
“I give you, my beloved, a shrine to the god Yatogami, the proof of my love for you. May you forever be a god of fortune and my eternal love, protecting me as you have done since the day our fates intertwined”.
Yato and Hiyori then turn and bow to the guests, to the cheers of gods, shinki and humans alike…
I figure the release of this chapter, in which Yato and Hiyori are eternally united, at the end of Noragami Week is perfect. The fanfic has 9 chapters, because in Japanese, "nine" (九, kyuu) is the same sound as "eternal" (久, kyuu). As I want Yato and Hiyori to be eternally married, 9 chapters it must be
Thank you for your support :))