Event time! Starting on Sunday, and ending on Friday, characters will believe they've been married to another character for a while! Muns will decide the pairings, which don't necessarily have to follow canon (Sakura/Syaoran is just as acceptable as Ioryogi/Ashura). And on Sunday, the characters'll wake up next to whoever they got paired up with.
It is not mandatory, and whoever does get affected will also not see anything wrong whatsoever with these new marriages, and they might even remember a wedding happening here in Kiseki.
You can put up lists of your chara's SOs here, or use the post to decide pairings. And as usual, feel free to ask any questions o/
ETA: Because someone asked and it makes sense; there'd be physical evidence of the weddings, too! Wedding rings, wedding pictures, the special clothes worn at them, etc. The clothes and rings would not disappear once the event's over.
And a clarification! People who're NOT affected will of course be WTFing at others, and those who're affected would not only find their own weddings normal, but other people's as well. Once it's over, those who were affected would remember the event happening but have the notion that the memories created by it were fake, kind of as if it'd been a very vivid dream.