I heard about this before it happened, because it was a thing that was happening, and then it was a thing that happened amongst the LM Hive Mind, which seems to be a force of nature in their own right. The thing in question is a future!wedding between Leon and Morgana, and it includes a combination of chat!cosplay, fanart, fanmixes, and an argument between Leon and Morgana over the wedding plans themselves.
There are too many posts for me to link to them all, but check out the #hive wedding tag over on Tumblr (or just
click this link) and scroll through.